Information-signal encrypting apparatus and...

Details Information-signal encrypting apparatus and... Information-signal encrypting apparatus and...

2004-08-26

2010-02-09

LaForgia, Christian (Department: 2439)

Electrical computers and digital processing systems: support

Data processing protection using cryptography

By stored data protection

C713S189000, C711S163000, C711S164000, C327S545000, C327S546000, C726S001000, C726S026000, C726S034000

Reexamination Certificate

active

07661001

ABSTRACT:
In an apparatus for encrypting an information signal into an encryption-resultant signal, a first encryption key peculiar to the present apparatus is generated. Key information is read out from a replaceable recording medium. A decision is made as to whether or not the read-out key information has been generated by an apparatus different from the present apparatus. A second encryption key is generated in response to the read-out key information when it is decided that the read-out key information has been generated by an apparatus different from the present apparatus. One is selected from the first encryption key and the second encryption key as a final encryption key. An information signal is encrypted in response to the final encryption key.

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