CA2338332A1 - Method and apparatus for effecting secure document format conversion - Google Patents
Method and apparatus for effecting secure document format conversion Download PDFInfo
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- CA2338332A1 CA2338332A1 CA002338332A CA2338332A CA2338332A1 CA 2338332 A1 CA2338332 A1 CA 2338332A1 CA 002338332 A CA002338332 A CA 002338332A CA 2338332 A CA2338332 A CA 2338332A CA 2338332 A1 CA2338332 A1 CA 2338332A1
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/60—Protecting data
- G06F21/606—Protecting data by securing the transmission between two devices or processes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
- H04L63/0428—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload
- H04L63/0442—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload wherein the sending and receiving network entities apply asymmetric encryption, i.e. different keys for encryption and decryption
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
- H04L63/0428—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload
- H04L63/0464—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload using hop-by-hop encryption, i.e. wherein an intermediate entity decrypts the information and re-encrypts it before forwarding it
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/08—Network architectures or network communication protocols for network security for authentication of entities
- H04L63/0823—Network architectures or network communication protocols for network security for authentication of entities using certificates
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/50—Network services
- H04L67/56—Provisioning of proxy services
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks
- H04L69/32—Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
- H04L69/322—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions
- H04L69/329—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions in the application layer [OSI layer 7]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2211/00—Indexing scheme relating to details of data-processing equipment not covered by groups G06F3/00 - G06F13/00
- G06F2211/007—Encryption, En-/decode, En-/decipher, En-/decypher, Scramble, (De-)compress
- G06F2211/008—Public Key, Asymmetric Key, Asymmetric Encryption
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/02—Network architectures or network communication protocols for network security for separating internal from external traffic, e.g. firewalls
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/02—Network architectures or network communication protocols for network security for separating internal from external traffic, e.g. firewalls
- H04L63/029—Firewall traversal, e.g. tunnelling or, creating pinholes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/50—Network services
- H04L67/56—Provisioning of proxy services
- H04L67/565—Conversion or adaptation of application format or content
Abstract
A method and apparatus is provided for effecting secure document delivery in any of various document formats. A document is encrypted with the public key of a server (10) associated with the recipient of the document, instead of with the public key of the intended recipient. The receiving server is located within a firewall. The encrypted document is forwarded to the server within the firewall. The server decrypts the document using its corresponding private key, converts the document to a new data representation, and then either forwards the document to the recipient inside the firewall, or re-encrypts the document with the public key of an intended recipient outside of the firewall or with the public key of another server that is associated with the intended recipient of the document.
Description
2 _1_ PCTIUS99/16642 METHOD AND APPARATUS FOR EFFECTING SECURE DOCUMENT
FORMAT CONVERSION
B,4CKGROUND OF THE INVENTION
TECHNICAL FIELD
The invention relates to electronic document delivery. More particularly, the .
invention relates to a metlEOd and apparatus for effecting secure document delivery and format conversion.
~IESCRIPTION OF THE PRIOR ART
lJne of the many complexities associated with delivering information between two disparate systems sterns from basic incompatibilities between those systems including, for example, differences in capabilities. A~ printer has a very different set of capabilities than a personal computer, and a commensurate set of data formats which the printer might accept.
A personal computer, for example, might be capable of processing a WordPerfect document, a portable document (e.g. Adobe Acrobat or Novell Envoy), or an HTMr, document. A printer, by contrast, might only be capable of accepting a PCL
file or a Postscript file. A fax machine, as with a printer, may only accept a Group 3 compressed black and white raster representation of a document. Thus, various devices have various capabilities in terms of the; types of data they may accept.
Similarly, different; data types offer different levels of flexibility and function. For example, an Envoy or PD:E file can be scaled to any resolution, can support millions of colors, and can include te:~t and fonts. A Group 3 compressed fax image, on the other hand, is limited in resolution, only supports black and white colors, and includes no text or fonts, thereby limiting the ability of a recipient of a Group 3 compressed image to perform any operations, except for rudimentary operations.
The extended flexibility of a more robust data representation, such as a portable document, enables such documents to be converted to less robust representations. By WO 00!05642 _2_ PCT/US99/16642 ', illustration, a portable document might be converted to a Postscript file or even a Group 3 compressed image. ~ne might therefore suggest that a portable document is a high level data representation and a tsroup 3 compressed image is a low level data representation.
In most cases, if the recipient system is capable of receiving a high level data representation, such representation is the data representation of choice due to the increased capabilities such representation provides. Thus, such representation offers a preferred , common format, especially if such representation inclludes a mechanism that can convert the high level representation to a lower level representation as necessary.
M. Williams, R. Yun, Method and Apparatus For Enhanced Electronic Mail Distribution, U.S. Patent No. 5,424,724 (13 June 1995) disclose a method and apparatus for enhanced electronic maI distribution which permits distribution of electronic mail documents to multiple host systems and/or external networks via a single host agent. A
host agent reference table ns established at selected host agents within a local network.
Each host agent reference table includes an identification of selected destination nodes associated with an identified host agent for those nodes. A referral to the host agent reference table is used to f.etermine the appropriate host agent for an electronic document destined for a selected node.
T. Schultz, A. Gross, B. Pappas. G. Shifrin, L. Mack, Apparatus and Method of Distributing Documents To Remote Terminals V4~ith Different Formats, U. S.
Patent No.
4;754,428 (28 3une 1988) and T. Schultz, A. Gross, B. Pappas. G. Shifiin, L.
Mack, Electronic Mail, U.S. Patent No. 4,713,780 {15 December 1987) disclose a method and apparatus for delivering a document originated at a local site by a source having a printer output that is normally cormected to a printer, to one or more remote locations having printers or display devices that may differ from the printer normally connected to the printer output of the document generating source. Printer command signals which are normally provided at the p inter output are converted to character and position data which represent the respective characters and their horizontal and vertical positions on each page of the document. The character and position data are transmitted to a remote location and WO 00/05642 . -3- PCTIIJS99/16642 reconverted to a form for driving a printer or other display device to produce a line-for-Line conforming copy of the original.
The '428 and '780 patents disclose the use of upstream data conversion, but do not provide downstream data conversion. That is, the '428 and °780 patents disclose a method and apparatus that allows text to be sent to a printer and converted to a printer specific format. However, such method and apparatus lacks the ability to start with a high-level representation of the data, and only convert to a lower level representation if such conversion is determined to be necessary. Thus, such approach is not satisfactory where printer format is not known or established prior to document origination, or where a heterogeneous network, such as the Internet, is used to deliver data.
L. Harkins, K. Hayward, T. Herceg, J. Levine, D. Parsons, Network Having Selectively Accessible Recipient Prioritized Communication Channel Profiles, U. S. Patent No. 5,513,126 (30 April I!~96) discloses a method for a sender to automatically distribute information to a receiver on a network using devices and communucations channels defined in a receiver profile. The rE;ceiver praflle establishes the properties and mode for receipt of information for receivers on the network and the profile is published in a neturork repository for all network users or is accessible for selected groups or individuals on the network. The disclosed network does not provide for data conversion, but rather involves sending predetermined data based on the capabilities of the recipient which are communicated through ch~umels. Thus, each recipient must first establish a format before data are exchanged.
M. Bloomfield, Sender-Based Facsimile Store and Forward Facility, I.S. Patent No.
5,404,231 (4 April 1995) discloses a system that provides sender-based store and forward services for delivering facsimile based information. The system is solely concerned with the delivery of facsimile bitmap images, and not with data conversion.
In view of the Iimit;ations attendant with the state of the art, it would be advantageous to provide a system in which the ability to descend to a lower level representation is preserved to allow the flexibility to do so at a future point in time, but that WO 00/05642 _4r PCT/US99/16642 also enables a richer set oj~ functions as appropriate. Such as system is described in J.
Smith, , patent application serial no. , filed. ' One potential shortcoming of the above referenced scheme occurs when secure document delivery is desired. For example, a document may be encrypted with the public key of an intended recipient to prevent unauthorized access to the document.
To convert the format of the data witlain the document, it is first necessary to decrypt the document.
Thereafter, the format of t:he data within the document rnay be converted and the converted document may then be encrypted. Unfortunately, decrypting the document defeats the purpose of any security that may have been provided to restrict access to the document.
That is, the document is readily accessed once it has been decrypted.
J. Chen, J.-S. Wang, Application Level Security System and.Method, U.S. Patent No. 5,602,918 (11 February 1997) disclose a system and method for establishing secured communications pathways across an open unsecured network by providing secured gateways or a firewall between the Internet and any party which desires protection. The disclosed technique uses a. smart card to distribute shared secret keys between a computer which serves as the firewa.ll and a client node on the Internet. The shared private keys establish mutual authentication between the gateway and the smart card. A
session or temporary secret key is generated for use in further communications between the gateway and the client node once communications have been established. Further communications are encrypted using the session key. While this approach provides one approach for securing communications across a network, it is not concerned with maintaining security while at the same time allowing document format conversion to occur.
R. Atkinson, Intermediate Network Authentication, U. S. Patent No. 5, 511,122 (23 April 1996) discloses an internetwork authentication method for verifying a, sending host by a receiving host or an intermediate router or gateway. The network address and public key of a receiving host is obtained. The pubic key from the receiving host is used in combination with a private; key of the originating host to generate a cryptographic signature. The signature a.nd data are transmitted through a first subnetwork in at least one WO 00/05642 ~5_ PCT/US99/16642 packet which packet is received at the receiving halt. The receiving host uses the private key of the receiviaig host site and a public key of the originating host to verify the cryptographic signature. Vfhile the document discloses a symmetrical form of private key-pubic key cryptography, there is no teaching with regard to secure document format conversion.
A. Aziz, Method and Apparatus for Key Management Scheme for Use with InterrretProtocols at Site Farewalls, U.S. Patent No. 5,416,842 (16 May 1995}
discloses a key management scheme for encryption of Internet protocol (IP) data packets between site firewalls. In this scheme, TI' packets only from site firewall to site firewall are encrypted.
Accordingly, only the firewall servers :need to participate in the scheme.
When a firewall receives an IP packet from an interior site node intended far a remote firewall, it encrypts;
the IP packet and sends it Encapsulated in another IP packet destined for the remote firewall. The remote firewa~l decrypts the encapsulated packet and sends it in the clear to the destination node on the; interior side of the remote firewall.
Accordingly, it is known to encapsulate a document in a secure packet, such that encryptian/decryption is performed between two firewalls on tlhe outside of the firewalls. Unfortunately, such scheme does not allow secure conversion of a document format. That is, once the packet is decrypted, the document is no longer secure. Even though the document is now inside the firewall, and thus presumed to be securf;, no technique is disclosed that allows the document to be converted to a different format.
It would be advantageous to provide a technique for efr'ecting secure document delivery in any of various clocument formats. ', ;SUMMARY OF THE INVENTION
The invention provides a method and apparatus for effecting secure document delivery in any of various document formats. The invention encrypts the document with the public key of a server associated with the recipient of the document, instead of encrypting the document with the public key of the intended recipient. For purposes of the invention, it is assumed that the receiving server is located within a firewall. The encrypted document is forwarded to the server vv~ithin the firewall. ' The server decrypts the document using its corresponding private key, converts the document to a new data representation, and then either forwards the document to the recipient inside the firewall, or re-encrypts the document with the public key of an intended recipient outside of the firewall or with the public key of another server that is associated with the intended recipient: of the document.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a block schematic diagram that shows an example of an application involving a dynamic document conversion server;
Figs. 2a-2e provide a series of block schematic diagrams which illustrate secure document conversion in accordance with a first preferred embodiment of the invention;
Figs. 3a-3c provide; a series of block schematic diagrams which illustrate secure document conversion in accordance r~rith a second, equally preferred embodiment of the invention; and Figs. 4a-4d provide a series of block schematic diagrams which illustrate secure document conversion in accordance with a third, equally preferred embodiment of the invention.
DETAI1~ED_ DESCRIPTION OF THE INVENTION
The invention incorporates a technique that defers the decision to descend to a lower level representation, thereby preserving the flexibility to do so at a future point in time, while also enabling a richer set of functions. This technique is disclosed in J. Smith, , U.S. patent application serial no, filed.
The preferred embodiment of the invention provides a method and apparatus for effecting secure document delivery in any of various document formats. One embodiment of the invention encrypts t:he document with the public key of a server associated with the WO OO/OS642 ~~~ PCT/L1S99116642 recipient of the document., instead of encrypting the document with the public key of the intended recipient. For purposes of the invention, it is assumed that the receiving server is located within a firewall. l:n this way, secure conversion of the document format is assured.
The encrypted document is forwarded to the server within the flrewall. The server decrypts the document usiing its corresponding private key, converts the document to a new data representation, ~u~d then either forwards the document to the recipient inside the fu-ewall, or (in an alternatE;, equally preferred embodiment of the invention) re-encrypts the document with the public key of an intended recipient outside of the flrewall or with the public key of another server that is the intended recipient of the document.
Fig. 1 is a block schematic diagram that shoves an example of an application involving a dynamic document conversion server {DDCS) which may be used in connection with the invention to effect document conversion. It should be appreciated that the DDCS
described herein is provided for purposes of illustration and example , and that the invention may be practiced with other format conversion techniques.
To illustrate and document the architecture of the DDCS, consider an example.
Suppose a sender 12 of a 'WordPerfect document wants to distribute a formatted document to a recipient. Suppose thE; sender does not know what capabilities the recipient may or may not possess, including; whether the recipient is a desktop computer 14; a facsimile machine 16, or printer 18. Tn such case, the sender could opt to convert the document to a low level representation acid then send that representation. However, if the recipient possesses a computer capable of receiving a higher level representation, then the recipient may lose such features of the document as color, scalability, or content.
Hence, the premature conversion of a document to a lower level representation limits the flexibility and function for the recipient.
If the sender sends, for example, a portable document representation of the WordPerfect document, thus preserving the document in a high level representation"
without offering the capabilities of the; DDCS for converting the document and the recipient turns out to be a printer, then the delivery fails.
Neither example above offers an optimal solution -- i.e. distributing the best data representation to the recipient, where best is defined as the highest level representation ~ ', based on the initial format of the data, as well as the capabilities of the recipient.
With the DDCS, the sender 12 of the document sends data to the recipient via the DDCS server 10, thus introducing a level of indirection between send and receive. The data are delivered from the sender to the DDCS server in a high level representation. The DDCS
server may propagate the data, bringing the data closer to the intended recipient. At each step, the DDCS can dynannically convert the data from a high level representation to a lower level representation, based an the data to be delivered and the next server or recipient's capabilities. Ultimately, a terminal DDCS server 2~ delivers the document to the recipient, making a final data conversion if necessary.
Suppose in the above example of a WordPerfect document, the sender 12 runs a Macintosh computer with WordPerfect, and the receiver is a fax machine 16. In this case, the sender transfers a high level representation of the WordPerfect document to the initial .
DDCS server 10. The conversion of the document from WordPerfect to a portable, high level representation, such as PDF, is transparent to the user. Such conversion may be performed by either the sender or by the initial DDCS in any known manner, for example with regard to the PDF format, as is readily offered by Adobe Acrobat. The initial DDCS
server accepts the PDF document, and then initiates a transfer to the recipient, based upon standard network protocols.
In this case, assume that the sender is located in San Francisco, while the recipient fax machine is in Paris. The DDCS server forwards the PDF document to another DDCS
server 20 in Paris. This second DDCS server then attempts to forward the document to the recipient. At the point of delivery, the second DDCS server learns, via database lookup or interactive dialog with the recipient, that the recipient is in fact a fax machine. The Paris DDCS server then discovers what capabilities the fax machine possesses. In this example, the fax machine supports (croup 4 compressed images. The Paris DDCS server then dynamically converts the P'DF document to a Group 4 compressed image using known techniques. In this case, Cxroup 4 compressed, black and white, 200 by 100 dots per inch is determined to be the best representation. ' Suppose, by contrast, that the Paris DDCS server 20 instead discovers that the recipient is a Hewlett-Pack:ard Color Deskjet printer 18. In this case, the Paris DDCS
server converts the document from PDF to the lower level HP Printer Control Language using conventional techniques. Unlike the previous case, the best representation in this case is color, 360 by 300 dots per inch.
Suppose, once more for contrast, the Paris DDCS server 20 discovers the recipient has a personal computer 14 running the DOS operating system. In this case, the Paris DDCS server sends a textL~al representation of the document to the recipient.
If the Paris DDCS ;server discovers that the recipient has a personal computer running the Windows operating system, with the Acrobat application installed (a program capable of reading a PDF file), the server forwaxds the PDF representation of the document.
Figs. 2a-Ze provide. a series of block schematic diagrams which illustrate secure document conversion in; accordance with a first preferred embodiment of the invention.
As shown in Fig. 2a, a sender 30 uses the public key 37 of a server 36 to perform encryption 33 on a documE;nt 3I, thereby producing an encrypted document 35.
In Fig. Zb, the sender 30 sends the encrypted document over a network 32 to the server 36. Significantly, thc~ server is isolated from the network by a firewaTl 34. For purposes of practicing the :invention, any type of fiiewall may be used (as is known in the art - see, for example, the discussion above regarding the background of the invention). By using a firewall, all processing of the encrypted document takes place in a secure environment. Thus, it is sake to decrypt the document (Fig. 2c) using a decryption scheme 41 in conjunction with the server°s private key 39. Because the document is now safe behind the firewall, e.g. within a private, supervised intranet or other secure network, the document may be converted (Fig. 2d) using a format canversion scheme 43, such.
as that discussed above in connection with Fig. 1. Thereafter, the converted document 45 is readily WO OQ/05642 -.~~- PCT/rJS99/16642 delivered to a recipient 38 (Fig. 2e) behind the firewall.
Figs. 3a-3c provide; a series of block schematic diagrams which illustrate secure ' document conversion in accordance with a second, equally preferred embodiment of the invention. For purposes of understanding Figs. 3a-3c it is assumed that a document has been sent to the server 36 .and document conversion has taken place, as discussed above in connection with Figs. 2a-2e.
In Fig. 3a, the recipient 50 sends its public key 55 to the server via the network.
The server uses the recipient's public key to perform an encryption step 51 on the ' converted document 45. This results in an encrypted, converted document 53.
The encrypted, converted document is then sent, via the network, to the recipient 50 (Fig. 3b). Significantly, this embodiment of the invention provides a technique for performing secure document conversion. That is, the encrypted document is decrypted and converted in a secure, private network behind the frewall. The converted document is then encrypted before it is sent t:o the recipient, which is located outside of the secure environment established by the firewall. Once the document is received by the recipient (Fig. 3c), the recipient's private key 5T is used to perform a decryption step 59 which recovers the converted document 45.
Figs. 4a-4d provide, a series of block schematic diagrams which illustrate secure document conversion in accordance with a third, equally preferred embodiment of the invention. In this embodiment of the irnvention, the document is encrypted, forwarded to a server located behind a firewall, and converted, all as described above in connection with Figs. 2a-2e. The converted document is encrypted during an encryption step 65 using the public key 61 of a remote server 62 {Fig. 4a). The converted, encrypted document 67 is sent via the network 32 to the remote server 62 (Fig. 4b). Significantly, the remote server is also located in a secure environment behind a firewall 60. ' The remote server uses its private key 63 to perform a decryption step 69, and thereby recover the converted document 45. {Fig. 4e). The converted document is then forwarded to the recipient 64 (Fig. 4d).
it should be noted that document conversion is performed in a secure environment in all embodiments of the invention. Thereafter, the converted document is forwarded to ~a recipient in a secure fashion, either within the conversion server's secure environment (i. e.
behind the firewall) or via a secure delivery technique, e.g. by reencrypting the document after it is converted and forwarding the encrypted, converted document directly to the recipient or to a server associated with the recipient.
Although the invention is described herein with reference to the preferred embodiment, one skilled in the art will readily appreciate that other applications may be substituted for those set forth herein without departing from the spirit and scope of the present invention. For example, while the invention is described herein in connection with public key-private key encryption scheme, it will be appreciated by those skilled in the art that other forms of crypto3~aphy may be used. Accordingly, the invention should only be limited by the Claims inciu.ded below.
FORMAT CONVERSION
B,4CKGROUND OF THE INVENTION
TECHNICAL FIELD
The invention relates to electronic document delivery. More particularly, the .
invention relates to a metlEOd and apparatus for effecting secure document delivery and format conversion.
~IESCRIPTION OF THE PRIOR ART
lJne of the many complexities associated with delivering information between two disparate systems sterns from basic incompatibilities between those systems including, for example, differences in capabilities. A~ printer has a very different set of capabilities than a personal computer, and a commensurate set of data formats which the printer might accept.
A personal computer, for example, might be capable of processing a WordPerfect document, a portable document (e.g. Adobe Acrobat or Novell Envoy), or an HTMr, document. A printer, by contrast, might only be capable of accepting a PCL
file or a Postscript file. A fax machine, as with a printer, may only accept a Group 3 compressed black and white raster representation of a document. Thus, various devices have various capabilities in terms of the; types of data they may accept.
Similarly, different; data types offer different levels of flexibility and function. For example, an Envoy or PD:E file can be scaled to any resolution, can support millions of colors, and can include te:~t and fonts. A Group 3 compressed fax image, on the other hand, is limited in resolution, only supports black and white colors, and includes no text or fonts, thereby limiting the ability of a recipient of a Group 3 compressed image to perform any operations, except for rudimentary operations.
The extended flexibility of a more robust data representation, such as a portable document, enables such documents to be converted to less robust representations. By WO 00!05642 _2_ PCT/US99/16642 ', illustration, a portable document might be converted to a Postscript file or even a Group 3 compressed image. ~ne might therefore suggest that a portable document is a high level data representation and a tsroup 3 compressed image is a low level data representation.
In most cases, if the recipient system is capable of receiving a high level data representation, such representation is the data representation of choice due to the increased capabilities such representation provides. Thus, such representation offers a preferred , common format, especially if such representation inclludes a mechanism that can convert the high level representation to a lower level representation as necessary.
M. Williams, R. Yun, Method and Apparatus For Enhanced Electronic Mail Distribution, U.S. Patent No. 5,424,724 (13 June 1995) disclose a method and apparatus for enhanced electronic maI distribution which permits distribution of electronic mail documents to multiple host systems and/or external networks via a single host agent. A
host agent reference table ns established at selected host agents within a local network.
Each host agent reference table includes an identification of selected destination nodes associated with an identified host agent for those nodes. A referral to the host agent reference table is used to f.etermine the appropriate host agent for an electronic document destined for a selected node.
T. Schultz, A. Gross, B. Pappas. G. Shifrin, L. Mack, Apparatus and Method of Distributing Documents To Remote Terminals V4~ith Different Formats, U. S.
Patent No.
4;754,428 (28 3une 1988) and T. Schultz, A. Gross, B. Pappas. G. Shifiin, L.
Mack, Electronic Mail, U.S. Patent No. 4,713,780 {15 December 1987) disclose a method and apparatus for delivering a document originated at a local site by a source having a printer output that is normally cormected to a printer, to one or more remote locations having printers or display devices that may differ from the printer normally connected to the printer output of the document generating source. Printer command signals which are normally provided at the p inter output are converted to character and position data which represent the respective characters and their horizontal and vertical positions on each page of the document. The character and position data are transmitted to a remote location and WO 00/05642 . -3- PCTIIJS99/16642 reconverted to a form for driving a printer or other display device to produce a line-for-Line conforming copy of the original.
The '428 and '780 patents disclose the use of upstream data conversion, but do not provide downstream data conversion. That is, the '428 and °780 patents disclose a method and apparatus that allows text to be sent to a printer and converted to a printer specific format. However, such method and apparatus lacks the ability to start with a high-level representation of the data, and only convert to a lower level representation if such conversion is determined to be necessary. Thus, such approach is not satisfactory where printer format is not known or established prior to document origination, or where a heterogeneous network, such as the Internet, is used to deliver data.
L. Harkins, K. Hayward, T. Herceg, J. Levine, D. Parsons, Network Having Selectively Accessible Recipient Prioritized Communication Channel Profiles, U. S. Patent No. 5,513,126 (30 April I!~96) discloses a method for a sender to automatically distribute information to a receiver on a network using devices and communucations channels defined in a receiver profile. The rE;ceiver praflle establishes the properties and mode for receipt of information for receivers on the network and the profile is published in a neturork repository for all network users or is accessible for selected groups or individuals on the network. The disclosed network does not provide for data conversion, but rather involves sending predetermined data based on the capabilities of the recipient which are communicated through ch~umels. Thus, each recipient must first establish a format before data are exchanged.
M. Bloomfield, Sender-Based Facsimile Store and Forward Facility, I.S. Patent No.
5,404,231 (4 April 1995) discloses a system that provides sender-based store and forward services for delivering facsimile based information. The system is solely concerned with the delivery of facsimile bitmap images, and not with data conversion.
In view of the Iimit;ations attendant with the state of the art, it would be advantageous to provide a system in which the ability to descend to a lower level representation is preserved to allow the flexibility to do so at a future point in time, but that WO 00/05642 _4r PCT/US99/16642 also enables a richer set oj~ functions as appropriate. Such as system is described in J.
Smith, , patent application serial no. , filed. ' One potential shortcoming of the above referenced scheme occurs when secure document delivery is desired. For example, a document may be encrypted with the public key of an intended recipient to prevent unauthorized access to the document.
To convert the format of the data witlain the document, it is first necessary to decrypt the document.
Thereafter, the format of t:he data within the document rnay be converted and the converted document may then be encrypted. Unfortunately, decrypting the document defeats the purpose of any security that may have been provided to restrict access to the document.
That is, the document is readily accessed once it has been decrypted.
J. Chen, J.-S. Wang, Application Level Security System and.Method, U.S. Patent No. 5,602,918 (11 February 1997) disclose a system and method for establishing secured communications pathways across an open unsecured network by providing secured gateways or a firewall between the Internet and any party which desires protection. The disclosed technique uses a. smart card to distribute shared secret keys between a computer which serves as the firewa.ll and a client node on the Internet. The shared private keys establish mutual authentication between the gateway and the smart card. A
session or temporary secret key is generated for use in further communications between the gateway and the client node once communications have been established. Further communications are encrypted using the session key. While this approach provides one approach for securing communications across a network, it is not concerned with maintaining security while at the same time allowing document format conversion to occur.
R. Atkinson, Intermediate Network Authentication, U. S. Patent No. 5, 511,122 (23 April 1996) discloses an internetwork authentication method for verifying a, sending host by a receiving host or an intermediate router or gateway. The network address and public key of a receiving host is obtained. The pubic key from the receiving host is used in combination with a private; key of the originating host to generate a cryptographic signature. The signature a.nd data are transmitted through a first subnetwork in at least one WO 00/05642 ~5_ PCT/US99/16642 packet which packet is received at the receiving halt. The receiving host uses the private key of the receiviaig host site and a public key of the originating host to verify the cryptographic signature. Vfhile the document discloses a symmetrical form of private key-pubic key cryptography, there is no teaching with regard to secure document format conversion.
A. Aziz, Method and Apparatus for Key Management Scheme for Use with InterrretProtocols at Site Farewalls, U.S. Patent No. 5,416,842 (16 May 1995}
discloses a key management scheme for encryption of Internet protocol (IP) data packets between site firewalls. In this scheme, TI' packets only from site firewall to site firewall are encrypted.
Accordingly, only the firewall servers :need to participate in the scheme.
When a firewall receives an IP packet from an interior site node intended far a remote firewall, it encrypts;
the IP packet and sends it Encapsulated in another IP packet destined for the remote firewall. The remote firewa~l decrypts the encapsulated packet and sends it in the clear to the destination node on the; interior side of the remote firewall.
Accordingly, it is known to encapsulate a document in a secure packet, such that encryptian/decryption is performed between two firewalls on tlhe outside of the firewalls. Unfortunately, such scheme does not allow secure conversion of a document format. That is, once the packet is decrypted, the document is no longer secure. Even though the document is now inside the firewall, and thus presumed to be securf;, no technique is disclosed that allows the document to be converted to a different format.
It would be advantageous to provide a technique for efr'ecting secure document delivery in any of various clocument formats. ', ;SUMMARY OF THE INVENTION
The invention provides a method and apparatus for effecting secure document delivery in any of various document formats. The invention encrypts the document with the public key of a server associated with the recipient of the document, instead of encrypting the document with the public key of the intended recipient. For purposes of the invention, it is assumed that the receiving server is located within a firewall. The encrypted document is forwarded to the server vv~ithin the firewall. ' The server decrypts the document using its corresponding private key, converts the document to a new data representation, and then either forwards the document to the recipient inside the firewall, or re-encrypts the document with the public key of an intended recipient outside of the firewall or with the public key of another server that is associated with the intended recipient: of the document.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a block schematic diagram that shows an example of an application involving a dynamic document conversion server;
Figs. 2a-2e provide a series of block schematic diagrams which illustrate secure document conversion in accordance with a first preferred embodiment of the invention;
Figs. 3a-3c provide; a series of block schematic diagrams which illustrate secure document conversion in accordance r~rith a second, equally preferred embodiment of the invention; and Figs. 4a-4d provide a series of block schematic diagrams which illustrate secure document conversion in accordance with a third, equally preferred embodiment of the invention.
DETAI1~ED_ DESCRIPTION OF THE INVENTION
The invention incorporates a technique that defers the decision to descend to a lower level representation, thereby preserving the flexibility to do so at a future point in time, while also enabling a richer set of functions. This technique is disclosed in J. Smith, , U.S. patent application serial no, filed.
The preferred embodiment of the invention provides a method and apparatus for effecting secure document delivery in any of various document formats. One embodiment of the invention encrypts t:he document with the public key of a server associated with the WO OO/OS642 ~~~ PCT/L1S99116642 recipient of the document., instead of encrypting the document with the public key of the intended recipient. For purposes of the invention, it is assumed that the receiving server is located within a firewall. l:n this way, secure conversion of the document format is assured.
The encrypted document is forwarded to the server within the flrewall. The server decrypts the document usiing its corresponding private key, converts the document to a new data representation, ~u~d then either forwards the document to the recipient inside the fu-ewall, or (in an alternatE;, equally preferred embodiment of the invention) re-encrypts the document with the public key of an intended recipient outside of the flrewall or with the public key of another server that is the intended recipient of the document.
Fig. 1 is a block schematic diagram that shoves an example of an application involving a dynamic document conversion server {DDCS) which may be used in connection with the invention to effect document conversion. It should be appreciated that the DDCS
described herein is provided for purposes of illustration and example , and that the invention may be practiced with other format conversion techniques.
To illustrate and document the architecture of the DDCS, consider an example.
Suppose a sender 12 of a 'WordPerfect document wants to distribute a formatted document to a recipient. Suppose thE; sender does not know what capabilities the recipient may or may not possess, including; whether the recipient is a desktop computer 14; a facsimile machine 16, or printer 18. Tn such case, the sender could opt to convert the document to a low level representation acid then send that representation. However, if the recipient possesses a computer capable of receiving a higher level representation, then the recipient may lose such features of the document as color, scalability, or content.
Hence, the premature conversion of a document to a lower level representation limits the flexibility and function for the recipient.
If the sender sends, for example, a portable document representation of the WordPerfect document, thus preserving the document in a high level representation"
without offering the capabilities of the; DDCS for converting the document and the recipient turns out to be a printer, then the delivery fails.
Neither example above offers an optimal solution -- i.e. distributing the best data representation to the recipient, where best is defined as the highest level representation ~ ', based on the initial format of the data, as well as the capabilities of the recipient.
With the DDCS, the sender 12 of the document sends data to the recipient via the DDCS server 10, thus introducing a level of indirection between send and receive. The data are delivered from the sender to the DDCS server in a high level representation. The DDCS
server may propagate the data, bringing the data closer to the intended recipient. At each step, the DDCS can dynannically convert the data from a high level representation to a lower level representation, based an the data to be delivered and the next server or recipient's capabilities. Ultimately, a terminal DDCS server 2~ delivers the document to the recipient, making a final data conversion if necessary.
Suppose in the above example of a WordPerfect document, the sender 12 runs a Macintosh computer with WordPerfect, and the receiver is a fax machine 16. In this case, the sender transfers a high level representation of the WordPerfect document to the initial .
DDCS server 10. The conversion of the document from WordPerfect to a portable, high level representation, such as PDF, is transparent to the user. Such conversion may be performed by either the sender or by the initial DDCS in any known manner, for example with regard to the PDF format, as is readily offered by Adobe Acrobat. The initial DDCS
server accepts the PDF document, and then initiates a transfer to the recipient, based upon standard network protocols.
In this case, assume that the sender is located in San Francisco, while the recipient fax machine is in Paris. The DDCS server forwards the PDF document to another DDCS
server 20 in Paris. This second DDCS server then attempts to forward the document to the recipient. At the point of delivery, the second DDCS server learns, via database lookup or interactive dialog with the recipient, that the recipient is in fact a fax machine. The Paris DDCS server then discovers what capabilities the fax machine possesses. In this example, the fax machine supports (croup 4 compressed images. The Paris DDCS server then dynamically converts the P'DF document to a Group 4 compressed image using known techniques. In this case, Cxroup 4 compressed, black and white, 200 by 100 dots per inch is determined to be the best representation. ' Suppose, by contrast, that the Paris DDCS server 20 instead discovers that the recipient is a Hewlett-Pack:ard Color Deskjet printer 18. In this case, the Paris DDCS
server converts the document from PDF to the lower level HP Printer Control Language using conventional techniques. Unlike the previous case, the best representation in this case is color, 360 by 300 dots per inch.
Suppose, once more for contrast, the Paris DDCS server 20 discovers the recipient has a personal computer 14 running the DOS operating system. In this case, the Paris DDCS server sends a textL~al representation of the document to the recipient.
If the Paris DDCS ;server discovers that the recipient has a personal computer running the Windows operating system, with the Acrobat application installed (a program capable of reading a PDF file), the server forwaxds the PDF representation of the document.
Figs. 2a-Ze provide. a series of block schematic diagrams which illustrate secure document conversion in; accordance with a first preferred embodiment of the invention.
As shown in Fig. 2a, a sender 30 uses the public key 37 of a server 36 to perform encryption 33 on a documE;nt 3I, thereby producing an encrypted document 35.
In Fig. Zb, the sender 30 sends the encrypted document over a network 32 to the server 36. Significantly, thc~ server is isolated from the network by a firewaTl 34. For purposes of practicing the :invention, any type of fiiewall may be used (as is known in the art - see, for example, the discussion above regarding the background of the invention). By using a firewall, all processing of the encrypted document takes place in a secure environment. Thus, it is sake to decrypt the document (Fig. 2c) using a decryption scheme 41 in conjunction with the server°s private key 39. Because the document is now safe behind the firewall, e.g. within a private, supervised intranet or other secure network, the document may be converted (Fig. 2d) using a format canversion scheme 43, such.
as that discussed above in connection with Fig. 1. Thereafter, the converted document 45 is readily WO OQ/05642 -.~~- PCT/rJS99/16642 delivered to a recipient 38 (Fig. 2e) behind the firewall.
Figs. 3a-3c provide; a series of block schematic diagrams which illustrate secure ' document conversion in accordance with a second, equally preferred embodiment of the invention. For purposes of understanding Figs. 3a-3c it is assumed that a document has been sent to the server 36 .and document conversion has taken place, as discussed above in connection with Figs. 2a-2e.
In Fig. 3a, the recipient 50 sends its public key 55 to the server via the network.
The server uses the recipient's public key to perform an encryption step 51 on the ' converted document 45. This results in an encrypted, converted document 53.
The encrypted, converted document is then sent, via the network, to the recipient 50 (Fig. 3b). Significantly, this embodiment of the invention provides a technique for performing secure document conversion. That is, the encrypted document is decrypted and converted in a secure, private network behind the frewall. The converted document is then encrypted before it is sent t:o the recipient, which is located outside of the secure environment established by the firewall. Once the document is received by the recipient (Fig. 3c), the recipient's private key 5T is used to perform a decryption step 59 which recovers the converted document 45.
Figs. 4a-4d provide, a series of block schematic diagrams which illustrate secure document conversion in accordance with a third, equally preferred embodiment of the invention. In this embodiment of the irnvention, the document is encrypted, forwarded to a server located behind a firewall, and converted, all as described above in connection with Figs. 2a-2e. The converted document is encrypted during an encryption step 65 using the public key 61 of a remote server 62 {Fig. 4a). The converted, encrypted document 67 is sent via the network 32 to the remote server 62 (Fig. 4b). Significantly, the remote server is also located in a secure environment behind a firewall 60. ' The remote server uses its private key 63 to perform a decryption step 69, and thereby recover the converted document 45. {Fig. 4e). The converted document is then forwarded to the recipient 64 (Fig. 4d).
it should be noted that document conversion is performed in a secure environment in all embodiments of the invention. Thereafter, the converted document is forwarded to ~a recipient in a secure fashion, either within the conversion server's secure environment (i. e.
behind the firewall) or via a secure delivery technique, e.g. by reencrypting the document after it is converted and forwarding the encrypted, converted document directly to the recipient or to a server associated with the recipient.
Although the invention is described herein with reference to the preferred embodiment, one skilled in the art will readily appreciate that other applications may be substituted for those set forth herein without departing from the spirit and scope of the present invention. For example, while the invention is described herein in connection with public key-private key encryption scheme, it will be appreciated by those skilled in the art that other forms of crypto3~aphy may be used. Accordingly, the invention should only be limited by the Claims inciu.ded below.
Claims (30)
1. A method for effecting secure document delivery in any of a plurality of document formats, comprising the steps of:
encrypting said document with a public key of a server associated with a recipient of the document, wherein said server is located within a firewall;
forwarding said encrypted document to said server within said firewall;
decrypting said document- withr-said setvar using -said corresponding private key;
converting said document to a new data representation; and forwarding said document to said recipient.
encrypting said document with a public key of a server associated with a recipient of the document, wherein said server is located within a firewall;
forwarding said encrypted document to said server within said firewall;
decrypting said document- withr-said setvar using -said corresponding private key;
converting said document to a new data representation; and forwarding said document to said recipient.
2. The method of Claim 1, wherein said recipient is located inside said firewall.
3. The method of Claim 2, further comprising the step of:
reencrypting said document with a public key of said recipient, wherein said recipient is located outside of said firewall.
reencrypting said document with a public key of said recipient, wherein said recipient is located outside of said firewall.
4. The method of Claim 1, further comprising the step of:
reencrypting said document with a public key of a remote server, wherein said remote server is associated with said recipient.
reencrypting said document with a public key of a remote server, wherein said remote server is associated with said recipient.
5. The method of Claim 1, further comprising the steps of:
sending a high level representation of said document to said recipient via said server, wherein said server comprises a dynamic docunnent conversion server;
deferring a decision to descend to a lower level representation;
determining a most appropriate level of representation for said document based upon said recipient's capability to reproduce said document;
converting said document to a lower level representation as appropriate and necessary for said recipient's capability to reproduce said document; and completing delivery of said document to said recipient.
sending a high level representation of said document to said recipient via said server, wherein said server comprises a dynamic docunnent conversion server;
deferring a decision to descend to a lower level representation;
determining a most appropriate level of representation for said document based upon said recipient's capability to reproduce said document;
converting said document to a lower level representation as appropriate and necessary for said recipient's capability to reproduce said document; and completing delivery of said document to said recipient.
6. The method of Claim 1, further comprising the steps of:
sending a public key from said recipient to said server via a network;
reencrypting said converted document using said recipient's public key;
sending said encrypted, converted document via said network to said recipient; and decrypting said encrypted, converted document received by said recipient with said recipient's private key; wherein said encrypted document is initially decrypted and converted in a secure, private network behind said firewall; and wherein said converted document is reencrypted before it is sent to said recipient, which is located outside of said secure environment established by said firewall.
sending a public key from said recipient to said server via a network;
reencrypting said converted document using said recipient's public key;
sending said encrypted, converted document via said network to said recipient; and decrypting said encrypted, converted document received by said recipient with said recipient's private key; wherein said encrypted document is initially decrypted and converted in a secure, private network behind said firewall; and wherein said converted document is reencrypted before it is sent to said recipient, which is located outside of said secure environment established by said firewall.
7. The method of Claim 1, further comprising the steps of:
reencrypting said converted using a public key of a remote server;
sending said converted, encrypted document via a network to said remote server;
wherein said remote server is located in a secure environment behind a firewall associated with said remote server; decrypting said encrypted, converted document at said remote server with a remote server private key; and forwarding said converted document to said recipient.
reencrypting said converted using a public key of a remote server;
sending said converted, encrypted document via a network to said remote server;
wherein said remote server is located in a secure environment behind a firewall associated with said remote server; decrypting said encrypted, converted document at said remote server with a remote server private key; and forwarding said converted document to said recipient.
8. A method for effecting secure document delivery in any of a plurality of document formats, comprising the steps of:
encrypting said document;
forwarding said encrypted document to a server within said firewall;
decrypting said document with said server;
converting said document to a new data representation; and forwarding said document to a recipient.
encrypting said document;
forwarding said encrypted document to a server within said firewall;
decrypting said document with said server;
converting said document to a new data representation; and forwarding said document to a recipient.
9. The method of Claim 8, wherein said recipient is located inside said firewall.
10. The method of Claim 8, further comprising the step of:
reencrypting said document prior to forwarding to said recipient, wherein said recipient is located outside of said firewall.
reencrypting said document prior to forwarding to said recipient, wherein said recipient is located outside of said firewall.
11. The method of Claim 8, further comprising the step of:
reencrypting said document prior to forwarding to a remote server;
wherein said remote server is located behind an associated firewall; and wherein said remote server is associated with said recipient.
reencrypting said document prior to forwarding to a remote server;
wherein said remote server is located behind an associated firewall; and wherein said remote server is associated with said recipient.
12. The method of Claim 8, further comprising the steps of:
sending a high level representation of said document to said recipient via said server, wherein said server comprises a dynamic document conversion server;
deferring a decision to descend to a lower level representation;
determining a most appropriate level of representation for said document based upon said recipient's capability to reproduce said document;
converting sa-iddocument-to a lower level representation as appropriate aand necessary for said recipient's capability to reproduce said document; and completing delivery of said document to said recipient.
sending a high level representation of said document to said recipient via said server, wherein said server comprises a dynamic document conversion server;
deferring a decision to descend to a lower level representation;
determining a most appropriate level of representation for said document based upon said recipient's capability to reproduce said document;
converting sa-iddocument-to a lower level representation as appropriate aand necessary for said recipient's capability to reproduce said document; and completing delivery of said document to said recipient.
13. A method far effecting secure document format conversion, comprising the steps of:
sending a document having a high level representation to a recipient;
intercepting said document at a secure server and performing document format conversion in a secure environment established by said server; and forwarding said converted document to a recipient in a secure fashion, within any of said server's secure environment or via a secure delivery technique.
sending a document having a high level representation to a recipient;
intercepting said document at a secure server and performing document format conversion in a secure environment established by said server; and forwarding said converted document to a recipient in a secure fashion, within any of said server's secure environment or via a secure delivery technique.
14. The method of Claim 13, said secure delivery technique comprising the steps of:
reencrypting said document after it is converted; and forwarding said encrypted, converted document directly to said recipient.
reencrypting said document after it is converted; and forwarding said encrypted, converted document directly to said recipient.
15. The method of Claim 13, said secure delivery technique comprising the steps of:
reencrypting said document after it is converted; and forwarding said encrypted, converted document to a secure server associated with said recipient.
reencrypting said document after it is converted; and forwarding said encrypted, converted document to a secure server associated with said recipient.
16. An apparatus for effecting secure document delivery in any of a plurality of document formats, comprising:
means for encrypting said document with a public key of a server associated with a recipient of the document, wherein said server is located within a firewall;
means for forwarding said encrypted document to said server within said firewall;
means for decrypting said document with said server using said server's corresponding private key;
means for converting said document to a new data representation; and means for forwarding said document to said recipient.
means for encrypting said document with a public key of a server associated with a recipient of the document, wherein said server is located within a firewall;
means for forwarding said encrypted document to said server within said firewall;
means for decrypting said document with said server using said server's corresponding private key;
means for converting said document to a new data representation; and means for forwarding said document to said recipient.
17. The apparatus of Claim 16, wherein said recipient is located inside said firewall.
18. The apparavtus of Claim 16, further comprising:
means for reencrypting said document with a public key of said recipient, wherein said recipient is located outside of said firewall.
means for reencrypting said document with a public key of said recipient, wherein said recipient is located outside of said firewall.
19. The apparatus of Claim 16, further comprising:
means for reencrypting said document with a public key of a remote server, wherein said remote server is associated with said recipient.
means for reencrypting said document with a public key of a remote server, wherein said remote server is associated with said recipient.
20. The apparatus of Claim 16, further comprising:
means for sending a high level representation of said document to said recipient via sand server, wherein said server comprises a dynamic document conversion server;
means for deferring a decision to descend to a lower level representation;
means for determining a most appropriate level of representation for said document based upon said recipient's capability to reproduce said document;
means for converting said document to a lower level representation as appropriate and necessary for said recipient's capability to reproduce said document; and means for completing delivery of said document to said recipient.
means for sending a high level representation of said document to said recipient via sand server, wherein said server comprises a dynamic document conversion server;
means for deferring a decision to descend to a lower level representation;
means for determining a most appropriate level of representation for said document based upon said recipient's capability to reproduce said document;
means for converting said document to a lower level representation as appropriate and necessary for said recipient's capability to reproduce said document; and means for completing delivery of said document to said recipient.
21. The apparatus of Claim 16, further comprising:
means for sending a public key from said recipient to said server via a network;
means for reencrypting said converted document using said recipient's public key;
means for sending said encrypted, converted document via said network to said recipient; and means for decrypting said encrypted, converted document received by said recipient with said recipient's private key;
wherein said encrypted document is initially decrypted and converted in a secure, private network behind said firewall; and wherein said converted document is reencrypted before it is sent to said recipient, which is located outside of said secure environment established by said firewall.
means for sending a public key from said recipient to said server via a network;
means for reencrypting said converted document using said recipient's public key;
means for sending said encrypted, converted document via said network to said recipient; and means for decrypting said encrypted, converted document received by said recipient with said recipient's private key;
wherein said encrypted document is initially decrypted and converted in a secure, private network behind said firewall; and wherein said converted document is reencrypted before it is sent to said recipient, which is located outside of said secure environment established by said firewall.
22. The apparatus of Claim 16, further comprising:
means for reencrypting said converted using a public key of a remote server;
means for sanding said converted, encrypted documem via a network to said remote server;
wherein said remote server is located in a secure environment behind a firewall associated with said remote server; means for decrypting said encrypted, converted document at said remote server with a remote server private key; and means for forwarding said converted document to said recipient.
means for reencrypting said converted using a public key of a remote server;
means for sanding said converted, encrypted documem via a network to said remote server;
wherein said remote server is located in a secure environment behind a firewall associated with said remote server; means for decrypting said encrypted, converted document at said remote server with a remote server private key; and means for forwarding said converted document to said recipient.
23. An apparatus for effecting secure document delivery in any of a plurality of document formats, comprising:
means for encrypting said document;
means for forwarding said encrypted document to a server within said firewall;
means for decrypting said document with said server;
means for converting said document to a new data representation; and means for forwarding said document to a recipient.
means for encrypting said document;
means for forwarding said encrypted document to a server within said firewall;
means for decrypting said document with said server;
means for converting said document to a new data representation; and means for forwarding said document to a recipient.
24. The apparatus of Claim 23, wherein said recipient is located inside said firewall.
25. The apparatus of Claim 23, further comprising:
reencrypting said document prior to forwarding to said recipient, wherein said recipient is located outside of said firewall.
reencrypting said document prior to forwarding to said recipient, wherein said recipient is located outside of said firewall.
26. The apparatus of Claim 23, further comprising:
means for reencrypting said document prior to forwarding to a remote server;
wherein said remote server is located behind an associated firewall; and wherein said remote server is associated with said recipient.
means for reencrypting said document prior to forwarding to a remote server;
wherein said remote server is located behind an associated firewall; and wherein said remote server is associated with said recipient.
27. The apparatus of Claim 23, further comprising:
means for sending a high level representation of said document to said recipient via said server, wherein said server comprises a dynamic document conversion server;
means for deferring a decision to descend to a lower level representation;
means for determining a most appropriate level of representation for said document based upon said recipient's capability to reproduce said document;
means for converting said document to a lower level representation as appropriate and necessary for said recipient's capability to reproduce said document; and means far completing delivery of said document to said recipient.
means for sending a high level representation of said document to said recipient via said server, wherein said server comprises a dynamic document conversion server;
means for deferring a decision to descend to a lower level representation;
means for determining a most appropriate level of representation for said document based upon said recipient's capability to reproduce said document;
means for converting said document to a lower level representation as appropriate and necessary for said recipient's capability to reproduce said document; and means far completing delivery of said document to said recipient.
28. An apparatus for effecting secure document format conversion, comprising:
means for sending a document having a high level representation to a recipient;
means for intercepting said document at a secure server and performing document format conversion in a secure environment established by said server;
and means for forwarding said converted document to a recipient in a secure fashion, within any of said server's secure environment or via a secure delivery
means for sending a document having a high level representation to a recipient;
means for intercepting said document at a secure server and performing document format conversion in a secure environment established by said server;
and means for forwarding said converted document to a recipient in a secure fashion, within any of said server's secure environment or via a secure delivery
29. The apparatus of Claim 28, said secure delivery mechanism comprising:
means for reencrypting said document after it is converte& and means for forwarding said encrypted, converted document directly to said recipient.
means for reencrypting said document after it is converte& and means for forwarding said encrypted, converted document directly to said recipient.
30. The apparatus of Claim 28, said secure delivery mechanism comprising:
means for reencrypting said document after it is converted; and means far forwarding said encrypted, converted document to a secure server associated with said recipient.
means for reencrypting said document after it is converted; and means far forwarding said encrypted, converted document to a secure server associated with said recipient.
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US8054970B2 (en) | 2004-07-22 | 2011-11-08 | Canon Kabushiki Kaisha | Image forming apparatus, image forming method, information processing apparatus and information processing method |
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US6260043B1 (en) | 1998-11-06 | 2001-07-10 | Microsoft Corporation | Automatic file format converter |
-
1998
- 1998-07-23 US US09/122,619 patent/US6151675A/en not_active Expired - Lifetime
-
1999
- 1999-07-23 CA CA002338332A patent/CA2338332A1/en not_active Abandoned
- 1999-07-23 AU AU51251/99A patent/AU5125199A/en not_active Abandoned
- 1999-07-23 EP EP99935866A patent/EP1105791A4/en not_active Withdrawn
- 1999-07-23 JP JP2000561550A patent/JP2002521893A/en active Pending
- 1999-07-23 WO PCT/US1999/016642 patent/WO2000005642A1/en not_active Application Discontinuation
-
2000
- 2000-11-17 US US09/715,940 patent/US6470086B1/en not_active Expired - Lifetime
-
2001
- 2001-01-22 NO NO20010366A patent/NO20010366L/en not_active Application Discontinuation
- 2001-12-10 US US10/013,765 patent/US6516411B2/en not_active Expired - Lifetime
-
2003
- 2003-02-03 US US10/356,833 patent/US6748529B2/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8054970B2 (en) | 2004-07-22 | 2011-11-08 | Canon Kabushiki Kaisha | Image forming apparatus, image forming method, information processing apparatus and information processing method |
Also Published As
Publication number | Publication date |
---|---|
JP2002521893A (en) | 2002-07-16 |
US6748529B2 (en) | 2004-06-08 |
EP1105791A4 (en) | 2005-08-10 |
US6470086B1 (en) | 2002-10-22 |
NO20010366L (en) | 2001-03-20 |
WO2000005642A1 (en) | 2000-02-03 |
US20030115450A1 (en) | 2003-06-19 |
AU5125199A (en) | 2000-02-14 |
NO20010366D0 (en) | 2001-01-22 |
US6516411B2 (en) | 2003-02-04 |
US6151675A (en) | 2000-11-21 |
US20020042876A1 (en) | 2002-04-11 |
EP1105791A1 (en) | 2001-06-13 |
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FZDE | Discontinued |