Method for producing and checking forge-proof documents

Details Method for producing and checking forge-proof documents Method for producing and checking forge-proof documents

2007-06-26

2007-06-26

Barrón, Jr., Gilberto (Department: 2132)

Electrical computers and digital processing systems: support

Computer program modification detection by cryptography

Reexamination Certificate

active

10089858

ABSTRACT:
The invention relates to a method for producing forgery-proof documents using a security module, whereby the security module generates a temporary secret which remains unknown to a document producer, whereby the temporary secret, together with information that reveals details about the identity of the security module, is transferred in encrypted form to an authentication unit, whereby an authentication unit decrypts the temporary secret, recognizes the identity of the security module and encrypts the temporary secret, together with additional information, in such a way that only a checking unit can carry out a decryption and then the authentication unit transmits the encrypted temporary secret and the additional information to the document producer, whereby the document producer transfers its own data, which has been introduced into the document, to the security module, whereby the security module irreversibly links the temporary secret with the data that the document producer itself has introduced, in such a way that only when the same data is linked again in the same manner can an identical result be obtained, and whereby it is not possible to draw conclusions about the temporary secret. The method according to the invention is characterized in that the result of the irreversible linking of the temporary secret with the data introduced by the document producer is incorporated into the document. The invention also relates to a method for checking the authenticity of a given document.

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