High security evolutive coding process and device for carrying o

Details High security evolutive coding process and device for carrying o High security evolutive coding process and device for carrying o

1987-10-29

1990-05-01

Buczinski, Stephen C.

Cryptography

Key management

Having particular key generator

380 28, H04L 902

Patent

active

049225332

ABSTRACT:
An evolutive coding process using a pseudo-random discontinuous function for coding remote controls, such as for automobiles. A message containing at least two pseudo-random values calculated by the pseudo-random discontinuous function is transmitted. Preferably the pseudo-random values are successive values of the pseudo-random discontinuous function, and the message optionally includes a code derived as a function of a specific base code associated with the system. The general preferred form of complete code message may take the form T(C) plus FA(C,n-1), plus FA(C,n) where T is a continuous function and FA is a pseudo-random discontinuous function.

REFERENCES:
patent: 3891793 (1975-06-01), DeLoye
patent: 4071692 (1978-01-01), Weir et al.
patent: 4241447 (1980-12-01), Epstein
patent: 4363130 (1982-12-01), Ramsay et al.
patent: 4606039 (1986-08-01), Nicolas et al.

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