Method for generating random number for the encoded transmission

Details Method for generating random number for the encoded transmission Method for generating random number for the encoded transmission

1991-10-01

1992-09-15

Levy, Stuart S.

Registers

Systems controlled by data bearing records

Credit or identification card systems

235379, G06K 500, G06F 1530

Patent

active

051480077

ABSTRACT:
Proceeding on the basis of a mutual authentification of two subscribers, wherein for one user an authorization parameter is formed using a secret cipher and an implemented ciphering algorithm dependent on a random number transmitted from the other subscriber, the authorization parameter being transmitted back to the other subscriber as a check, a new starting value for the one user's own random number generator is formed by a logical operation on the authorization parameter using the previous random number most recently generated and stored at the one user, the new random number of this random number generator being both stored as well as transmitted to the other subscriber.

REFERENCES:
patent: 4283599 (1981-08-01), Atalla
patent: 4630201 (1986-12-01), White
patent: 4709136 (1987-11-01), Watanabe
patent: 4746788 (1988-05-01), Kawana
patent: 4786790 (1988-11-01), Kruse et al.
patent: 4799061 (1989-01-01), Abraham et al.
patent: 4974193 (1990-11-01), Beutelspacher

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