System for encryption and identification

Details System for encryption and identification System for encryption and identification

1990-10-05

1992-11-03

Gregory, Bernarr E.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 9, 380 24, 380 52, 341 23, 341175, 340543, 340712, 34082531, 34082534, G06F 302

Patent

active

051611902

ABSTRACT:
A delay means in a security apparatus for identifying a code of characters to authenticate access to the apparatus by matching an entered code with a stored value by a procedure which so enciphers the coded information as it is entered into the apparatus and displayed on a keyboard that disclosure of the code by observation of the entry operation is prevented. A delay timing circuit produces a delayed signal in the matching of the entered code and the stored value so that the length of the period of time for authentication is controllable.

REFERENCES:
patent: 4184148 (1980-01-01), Smagala-Romanoff
patent: 4333090 (1982-06-01), Hirsch
patent: 4479112 (1984-10-01), Hirsch
patent: 4502048 (1985-02-01), Rehm
patent: 4962530 (1990-10-01), Cairns

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