Authenticator circuit

Details Authenticator circuit Authenticator circuit

1980-03-03

1994-09-27

Cain, David C.

Cryptography

Electric signal modification

Having production of printed copy

331 78, 364717, H04L 900

Patent

active

053513010

ABSTRACT:
An authenticator circuit and message authentication apparatus. The circuit includes a plurality of shift register stages, some of which are separated by adders having an input from a succeeding stage. Switching circuits selectively control the second adder inputs to determine the shifting sequence of information passing through the register stages. A message authentication apparatus includes a key generator and authenticator circuit converted at the output of a transmitter. The input of a receiver includes a similar authenticator circuit and key generator, plus a counter.

REFERENCES:
patent: 3662337 (1972-05-01), Low
patent: 3700806 (1972-10-01), Vasseur
patent: 3749832 (1973-07-01), Lemoine
patent: 3751648 (1973-08-01), Wu
patent: 3885139 (1975-05-01), Hard
patent: 3895349 (1975-07-01), Robson
patent: 3911216 (1975-10-01), Bartek
patent: 3988538 (1976-10-01), Patten
patent: 4009374 (1977-02-01), Taylor
patent: 4023026 (1977-05-01), O'Farrell
patent: 4165444 (1979-08-01), Gordon

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