Method of extending the validity of a cryptographic certificate

Details Method of extending the validity of a cryptographic certificate Method of extending the validity of a cryptographic certificate

1992-12-21

1994-12-13

Gregory, Bernarr E.

Cryptography

Key management

Having particular key generator

380 23, 380 25, 380 30, H04L 900, H04L 930

Patent

active

053735617

ABSTRACT:
A cryptographic certificate attesting to the authenticity of original document elements, such as time of creation, content, or source, will lose its value when the cryptographic function underlying the certifying scheme is compromised. The present invention provides a means for extending the reliability of such a certificate by subjecting, prior to any such compromise, a combination of the original certificate and the document digital representation from which that certificate was derived to a scheme based on a different and ostensibly less vulnerable function. The new certificate resulting from this procedure extends the validity of the original authenticity by implacably incorporating the original certificate at a time when that certificate could only have been derived by legitimate means.

REFERENCES:
patent: 4405829 (1983-09-01), Rivest et al.
patent: 4625076 (1986-11-01), Okamoto et al.
patent: 4868877 (1989-09-01), Fischer
patent: 4881264 (1989-11-01), Merkle
patent: 4972474 (1990-11-01), Sabin
patent: 5001752 (1991-03-01), Fischer
patent: 5136646 (1992-08-01), Haber et al.
patent: 5136647 (1992-08-01), Haber et al.
Cryptography and Data Security, D. E. R. Denning, pp. 170-171, Addison-Wesley Publishing Company (1982).

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