CN102479297A - Copyright protection method based on public key system and digital watermarking - Google Patents
Copyright protection method based on public key system and digital watermarking Download PDFInfo
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- CN102479297A CN102479297A CN2010105628748A CN201010562874A CN102479297A CN 102479297 A CN102479297 A CN 102479297A CN 2010105628748 A CN2010105628748 A CN 2010105628748A CN 201010562874 A CN201010562874 A CN 201010562874A CN 102479297 A CN102479297 A CN 102479297A
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Abstract
The invention provides a copyright protection method based on a public key system and a digital watermarking. The method comprises the following steps of: utilizing a privet key to sign a digital work W of an author A to obtain a singed digital work Ss_A(W); utilizing a public key to successfully authenticate the Ss_A(W) by an RAC (Remote Access Controller); carrying out Hash calculation on the W to obtain an H(W); sending an Ss_RAC (H(W)) composed of the Ss_A(W), the H(W) and a time stamp T to a copyright management center RMC by the RAC; obtaining the W from the author A by the RMC and carrying out the Hash calculation on the W to obtain the H(W); after the authentication of the Ss_RAC (H(W)) is successful, sending a successful message to the RAC by the RMC; utilizing the identity of the digital work IDW, the identity of the author IDA, the identity of RAC IDRAC and the time stamp T to form watermarking information M by the RAC; embedding the M into the W to obtain a digital watermarking work MW; and protecting the copyright according to the MW. through the implementation of the embodiment of the invention, the digital copyright can be effectively protected.
Description
Technical field
The present invention relates to the copyright protection technology field, more specifically, relate to a kind of copy-right protection method based on public key cryptosyst and digital watermarking.
Background technology
Popularizing of computer technology rapid development and communication network, the data transmission of digital product is frequent day by day, and the copyright protection of corresponding digital product has received unprecedented threat.Intellecture property and its possessory economic interests in order to protect digital product generally adopt several different methods such as digital watermarking, password to set up the digital copyright protecting system.Cryptography comprises public key cryptosyst etc., and it lays particular emphasis on the access control of digital product and secret communication, but the copyright authentication and the piracy tracking problem of digital product seemed unable to do what one wishes.Digital watermark is having incomparable advantage aspect the piracy control of the real and fake discrimination of digital product and validated user, but uncontrollable access control and secret communication to digital product.How cryptography is combined with digital watermark with the copyright of protection digital product, also do not have relevant solution at present.
Summary of the invention
The embodiment of the invention proposes a kind of copy-right protection method based on public key cryptosyst and digital watermarking, can protect digital publishing rights effectively.
The technical scheme of the embodiment of the invention is following:
A kind of copy-right protection method based on public key cryptosyst and digital watermarking, this method comprises:
The back copyright Ss_A (W) that obtains signing after utilizing private key to the copyright W of author A signature is committed to copyright authentication center RAC with Ss_A (W);
RAC utilizes public key verifications Ss_A (W) success, W is carried out Hash operation obtain H (W), and RAC will be sent to copyright management center RMC by the Ss_RAC (H (W)) that Ss_A (W), H (W) and time stamp T constitute;
RMC obtains W by author A place, W is carried out Hash operation obtain H (W), and after H (W) checking Ss_RAC (H (W)) success, RMC sends success message to RAC;
RAC utilizes copyright code name IDW, author to identify sign IDRAC and the time stamp T structure watermark information M of IDA, RAC, M is embedded W obtain watermark digit works MW;
According to MW protection copyright.
Saidly comprise according to MW protection copyright, user B notice RMC change MW, RMC obtains new watermark digit works MWB according to sign IDB and the MW of user B, and MWB is sent to said user B.
Said RMC identifies IDB and MW according to the user and obtains new watermark digit works MWB and comprise that RMC forms and retrieval transaction chain AB, and utilizes Hash operation to obtain unique identification H (AB); H (AB), IDB and MW are sent to RAC; After RAC examines IDB and MW, utilize H (AB), IDB and MW structure watermark information MWB, and MWB is sent to RMC.
Saidly after being sent to said user B, MWB comprises further that RMC increases and upgrade the record of MW.
The sign IDB of the sign IDA of said author A, the sign IDRAC of said RAC, said user B and the code name IDW of said copyright all obtain from the certificate verification center CA.
Said method comprises that further to the ID IDA of RAC transmission IDW, time stamp T 0 and author A, RAC verifies IDW, T0 and IDA.
Said RAC checking IDW, T0 and IDA comprise that RAC retrieves IDW in database, obtain MW according to IDW from RMC then, if MW is identical with the MW that RMC retrieves from database, then IDW, T0 and IDA are through checking; Otherwise extract the watermark information of MW, judge whether the IDA in the said watermark information equals IDA, and whether the T in the said watermark information equals T0; If the IDA of said watermark information equals IDA; And T equals T0, and then IDW, T0 and IDA pass through checking, otherwise IDW, T0 and IDA are through checking.
Saidly comprise, IDA, IDB, T2 and MW are sent to RMC, in self database, whether retrieve MW according to RMC and judge directly then whether author B is validated user according to MW protection copyright; After RMC sent MW, IDA and T2 to RAC, RAC judged whether author A is the owner of MW; When author B is not a validated user, and A is the owner of MW, then judges the B infringement.
Saidly in self database, whether retrieve MW according to RMC and judge directly then whether author B is that validated user comprises, RMC checks the term of validity of MW from database, if not to the term of validity then author B be validated user; Otherwise, if retrieve exist in the chain transaction of MW B then author B be validated user, do not have then in the chain transaction of MW that author B is not a validated user if retrieve.
Said RAC judges whether author B encroaches right and comprises that RAC retrieves MW in database, is A if retrieve the owner of MW, confirms that then A is the owner of MW; Otherwise, from MW, extract watermark information, comprise IDA in the watermark information, and T2 equals T, confirm that then A is the owner of MW, otherwise confirm that A is not the owner of MW.
From technique scheme, can find out; In embodiments of the present invention; Utilize private key that the copyright W signature of author A is obtained Ss_A (W); W behind the RAC certifying signature carries out Hash operation to W and obtains H (W), and the Ss_RAC (H (W)) that is made up of Ss_A (W), H (W) and time stamp T is sent to copyright management center RMC; RMC obtains W by author A place, W is carried out Hash operation obtain H (W), and after H (W) checking Ss_RAC (H (W)) success, RMC sends success message to RAC; RAC utilizes copyright code name IDW, author to identify sign IDRAC and the time stamp T structure watermark information M of IDA, RAC, M is embedded W obtain watermark digit works MW, according to MW protection copyright.Information such as author's sign and timestamp are embedded in the copyright, when user's use has the watermark digit works of self information, just can normally use to have the watermark digit works.Therefore, can protect digital publishing rights effectively.
Description of drawings
Fig. 1 is the schematic flow sheet that the present invention is based on the copy-right protection method of public key cryptosyst and digital watermarking.
Embodiment
For making the object of the invention, technical scheme and advantage express clearlyer, the present invention is remake further detailed explanation below in conjunction with accompanying drawing and specific embodiment.
In embodiments of the present invention; Utilize public key cryptosyst to realize the information security transmission between author A and RAC, the RMC; Constitute watermark information by author's sign and timestamp etc., what the user used is the copyright that has watermark information, can protect the copyright of copyright effectively.
Be based on the schematic flow sheet of the copy-right protection method of public key cryptosyst and digital watermarking referring to accompanying drawing 1, step 101-104 is the process of author A registration W; The process of W is used in the step 105-108 person of being to use B request; Step 109-112 is the process of checking copyright; Step 113-115 is a process of judging infringement.Specifically may further comprise the steps:
Copyright behind step 101, the author A transmission signature is to RAC.
Author A is uploaded to RAC with oneself copyright and carries out copyright registration.The back copyright Ss_A (W) that obtains signing after promptly utilizing private key to the copyright W of author A signature is committed to RAC with Ss_A (W).Private key and PKI all belong to public key cryptosyst, obtain when the certificate verification center CA is registered the author.
Step 102, RAC send signature back copyright and timestamp.
The effect of RAC is an embed digital watermark and detect the watermark information in the copyright in copyright.In order to protect the copyright of copyright W, RAC need handle it after receiving copyright W as follows.At first, RAC carries out Hash operation to W and obtains H (W) after utilizing public key verifications Ss_A (W) success, and RAC will and comprise that the Ss_RAC (H (W)) of the time stamp T formation of time this moment is sent to RMC by Ss_A (W), H (W).The effect of RMC is copyright registration, inquiry, digital product trade management and copyright arbitration.
Step 103, transmission success message.
RMC obtains W by author A place, W is carried out Hash operation obtain H (W), and after H (W) checking Ss_RAC (H (W)) success, RMC sends success message to RAC; If RMC checking Ss_RAC (H (W)) failure, then process ends.
Step 104, structure watermark information.
RAC utilizes copyright code name IDW, author to identify sign IDRAC and the time stamp T structure watermark information M of IDA, RAC, M is embedded W obtain watermark digit works MW.In watermark digit works MW, there are copyright code name IDW, author to identify sign IDRAC and the time stamp T of IDA, RAC.The entitlement that ought need the enquiring digital works so only needs input digit works code name just can be easy to obtain its author information and timestamp information.
Step 105, user B send the message of change watermark digit works to RAC through RMC.
When user B need use copyright MW, then need send request to RMC, promptly RMC forms and retrieval transaction chain AB, and utilizes Hash operation to obtain unique identification H (AB).H (AB), IDB and MW are sent to RAC.Wherein, chain transaction is according to copyright W, and the author A of copyright W and user B constitute.
Wherein, copyright code name IDW, author identify the sign IDRAC of IDA, RAC and the sign IDB of user B all therefrom obtains.The effect of CA provides signing and issuing and issuing of letter of identity.
The copyright that step 106, transmission comprise new watermark is to RMC.
After RAC examines IDB and MW, utilize H (AB), IDB and MW structure watermark information MWB, and MWB is sent to RMC.Verification process is a prior art.
The copyright that step 107, transmission comprise new watermark is to user B.
The MWB that RAC is sent to RMC is sent to user B, so that user B uses this copyright.
If this user's watermark information not in the employed watermark digit works of user, this user can't normally use the watermark digit works so.Have only the user that this user's watermark information is arranged in the watermark digit works that use, just can normally use these watermark digit works.Through adding user's in the watermark digit works information, thereby can make this user normally use this watermark digit works.
Step 108, the storehouse Updates Information.
RMC increases and upgrades the record of MW, comprises in this record that user B uses the term of validity of copyright MW, and increases the copyright MWB that has user B sign.
Step 105-step 108, RMC obtains new watermark digit works MWB to sign IDB and the MW of user B.User B just can normally use copyright W like this.
Step 109, send information to be verified.
Author A sends information to be verified to RAC, is used to prove that author A is the owner of W.Wherein, information to be verified comprises the sign IDA of IDW, time stamp T 0 and author A.Time stamp T 0 is the time that author A preserves registration W.
Step 110, solicited message.
RAC retrieves IDW in database, then according to the watermark digit works MW of IDW to RMC request IDW correspondence.
Step 111, return message.
RMC returns according to IDW to RAC and inquires its corresponding watermark digit works MW.
Step 112, RAC verify.
If MW is identical with the MW that RMC retrieves from database, then need not again proving time stamp T0 and IDA, promptly IDW, T0 and IDA are through checking, and then author A is the author of copyright MW; Otherwise extract the watermark information of MW, judge whether the IDA in this watermark information equals IDA, and whether the T in this watermark information equals T0.If the IDA of this watermark information equals IDA, and T equals T0, and then IDW, T0 and IDA are through checking, and then author A is the author of copyright MW.Otherwise through checking, promptly author A is not the author of copyright MW for IDW, T0 and IDA.
Judgement information is treated in step 113, transmission.
Author A is sent to RMC with IDA, IDB, T2 and MW, judges by RMC whether the user encroaches right.T2 is the time that author A preserves registration W.
Step 114, RMC judge.
RMC checks the term of validity of MW from database, if be not validated user to the term of validity author B that then IDB is corresponding; Otherwise, if retrieve exist in the chain transaction of MW B then author B be validated user, do not have then in the chain transaction of MW that author B is not a validated user if retrieve.
Step 115, RMC send the watermark digit works to RAC, and RAC judges.
RAC receives watermark digit works MW, IDA and the T2 that RMC sends.RAC retrieves MW in database, be A if retrieve the owner of MW, confirms that then A is the owner of MW; Otherwise, from MW, extract watermark information, comprise IDA in the watermark information, and T2 equals T, confirm that then A is the owner of MW, otherwise confirm that A is not the owner of MW.
When author B is not a validated user, and A is the owner of MW, then judges the B infringement.
The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the copy-right protection method based on public key cryptosyst and digital watermarking is characterized in that, this method comprises:
The back copyright Ss_A (W) that obtains signing after utilizing private key to the copyright W of author A signature is committed to copyright authentication center RAC with Ss_A (W);
RAC utilizes public key verifications Ss_A (W) success, W is carried out Hash operation obtain H (W), and RAC will be sent to copyright management center RMC by the Ss_RAC (H (W)) that Ss_A (W), H (W) and time stamp T constitute;
RMC obtains W by author A place, W is carried out Hash operation obtain H (W), and after H (W) checking Ss_RAC (H (W)) success, RMC sends success message to RAC;
RAC utilizes copyright code name IDW, author to identify sign IDRAC and the time stamp T structure watermark information M of IDA, RAC, M is embedded W obtain watermark digit works MW;
According to MW protection copyright.
2. according to the said copy-right protection method of claim 1 based on public key cryptosyst and digital watermarking; It is characterized in that; Saidly comprise according to MW protection copyright; User B notice RMC change MW, RMC obtains new watermark digit works MWB according to sign IDB and the MW of user B, and MWB is sent to said user B.
3. according to the said copy-right protection method of claim 2 based on public key cryptosyst and digital watermarking; It is characterized in that; Said RMC identifies IDB and MW according to the user and obtains new watermark digit works MWB and comprise that RMC forms and retrieval transaction chain AB, and utilizes Hash operation to obtain unique identification H (AB); H (AB), IDB and MW are sent to RAC; After RAC examines IDB and MW, utilize H (AB), IDB and MW structure watermark information MWB, and MWB is sent to RMC.
4. according to the said copy-right protection method of claim 2, it is characterized in that, saidly further comprise that RMC increases and upgrade the record of MW after MWB is sent to said user B based on public key cryptosyst and digital watermarking.
5. according to the said copy-right protection method of claim 1 based on public key cryptosyst and digital watermarking; It is characterized in that the sign IDB of the sign IDA of said author A, the sign IDRAC of said RAC, said user B and the code name IDW of said copyright all obtain from the certificate verification center CA.
6. according to the said copy-right protection method of claim 1, it is characterized in that said method comprises that further to the ID IDA of RAC transmission IDW, time stamp T 0 and author A, RAC verifies IDW, T0 and IDA based on public key cryptosyst and digital watermarking.
7. according to the said copy-right protection method of claim 6 based on public key cryptosyst and digital watermarking; It is characterized in that; Said RAC checking IDW, T0 and IDA comprise that RAC retrieves IDW in database, obtain MW according to IDW from RMC then; If MW is identical with the MW that RMC retrieves from database, then IDW, T0 and IDA are through checking; Otherwise extract the watermark information of MW, judge whether the IDA in the said watermark information equals IDA, and whether the T in the said watermark information equals T0; If the IDA of said watermark information equals IDA; And T equals T0, and then IDW, T0 and IDA pass through checking, otherwise IDW, T0 and IDA are through checking.
8. according to the said copy-right protection method of claim 1 based on public key cryptosyst and digital watermarking; It is characterized in that; Saidly comprise according to MW protection copyright; IDA, IDB, T2 and MW are sent to RMC, in self database, whether retrieve MW according to RMC and judge directly then whether author B is validated user; After RMC sent MW, IDA and T2 to RAC, RAC judged whether author A is the owner of MW; When author B is not a validated user, and A is the owner of MW, then judges the B infringement.
9. said according to Claim 8 copy-right protection method based on public key cryptosyst and digital watermarking; It is characterized in that; Saidly in self database, whether retrieve MW according to RMC and judge directly then whether author B is that validated user comprises; RMC checks the term of validity of MW from database, if not to the term of validity then author B be validated user; Otherwise, if retrieve exist in the chain transaction of MW B then author B be validated user, do not have then in the chain transaction of MW that author B is not a validated user if retrieve.
10. said according to Claim 8 copy-right protection method based on public key cryptosyst and digital watermarking; It is characterized in that said RAC judges whether author B encroaches right and comprises that RAC retrieves MW in database; If retrieving the owner of MW is A, confirm that then A is the owner of MW; Otherwise, from MW, extract watermark information, comprise IDA in the watermark information, and T2 equals T, confirm that then A is the owner of MW, otherwise confirm that A is not the owner of MW.
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