Production protection system dealing with contents that are...

Data processing: financial – business practice – management – or co – Business processing using cryptography – Usage protection of distributed data files

Reexamination Certificate

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Details

C705S050000, C713S150000, C380S255000

Reexamination Certificate

active

06862582

ABSTRACT:
A data protection system obtains data having a first content on which a first encryption has been performed and a second content on which a second encryption has been performed, the second encryption more difficult to break than the first encryption. A first content decryption unit decrypts the first content, using a first encryption method corresponding to the first encryption of the first content. A second content decryption unit decrypts the second content using a second decryption method that corresponds to the second encryption. The decrypting contents can be executed by a software, and the second content decryption unit can include one of tamperproof hardware and an apparatus that executes tamperproof software.

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patent: 20010019615 (2001-09-01), Kato et al.
patent: 0718756 (1996-06-01), None
Needham et al., “Using Encryption for Authentication in Large Networks of Computers”, 1978, ACM.

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