Method and apparatus for changing the master key in a cryptograp

Details Method and apparatus for changing the master key in a cryptograp Method and apparatus for changing the master key in a cryptograp

1985-03-15

1990-11-20

Cangialosi, Salvatore

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 23, 380 24, H04K 100

Patent

active

049724720

ABSTRACT:
A method and apparatus for changing the key in a cryptographic system or device are disclosed. A memory contains three storage areas for pending, active, and retired keys. New keys are loaded into the pending storage area. The key is changed by shifting the pending key into the active storage area and shifting the active key into the retired area for use by applications which have not been made aware of the key change. When an application presents a retired key, use of the retired key is allowed and the new key is returned to the application.

REFERENCES:
patent: Re29259 (1977-06-01), Sabsay
patent: 4386234 (1983-05-01), Ehrsam et al.
patent: 4464732 (1984-08-01), Clark
patent: 4558175 (1985-12-01), Genest et al.
patent: 4578531 (1986-03-01), Everhart et al.
patent: 4605820 (1986-08-01), Campbell, Jr.
"PIN Manual" Interbank Card Association, Printed 1980.

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