The present invention consists of a method and apparatus for authenticating an electronic document. In one embodiment of the invention, a party wishing to digitally sign an electronic document (the "client") stores the unsigned electronic document, and the client's public and private keys, on transportable...http://www.google.com/patents/US5872848?utm_source=gb-gplus-sharePatent US5872848 - Method and apparatus for witnessed authentication of electronic documents
