Data generating apparatus and data verifying apparatus

Details Data generating apparatus and data verifying apparatus Data generating apparatus and data verifying apparatus

2006-02-07

2006-02-07

Barron, Jr., Gilberto (Department: 2132)

Electrical computers and digital processing systems: support

Data processing protection using cryptography

By stored data protection

C713S189000, C380S045000

Reexamination Certificate

active

06996723

ABSTRACT:
Integrity of data is to be ensured in a simple manner. A data verifier generates a signature generation request from data to be signed and signature request time, and sends the request to a data generator. The data generator extracts the data to be signed from the signature generation request, and its signature generation unit generates a signature for the data. A key generation unit generates a key from a previous key, the signature request time in the signature generation request, and the identifier of the data generator, and an encryptor encrypts the signature. After that, the encrypted signature and the like are returned to the data verifier, which generates a decrypting key with a key generation unit from the previous key, the signature request time, and the identifier of the data generator, then extracts an encrypted signature, and decrypts it with a decryptor. A signature verification unit checks whether or not the result of decrypting is the correct signature.

REFERENCES:
patent: 5502766 (1996-03-01), Boebert et al.
patent: 5689565 (1997-11-01), Spies et al.
patent: 5757920 (1998-05-01), Misra et al.
patent: 6496928 (2002-12-01), Deo et al.
“Computer Communications Security” W. Ford, Prentice Hall P T R, 1994, pp. 75-81.

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