Arrangement for and method of protecting private security codes

Cryptography – Particular algorithmic function encoding – Nbs/des algorithm

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380 23, H04L 900

Patent

active

047590629

ABSTRACT:
A private security code used for rendering microprocessor-based electronic equipment operational need not be selected or remembered by the user of the equipment. Instead, an authorized service center generates the private security code needed to re-enable disabled equipment. The equipment includes a built-in microprocessor for executing a program stored in internal memory, a random number generator for generating an unpredictable code, and a display for displaying the unpredictable code. The microprocessor also executes an encryption routine for encrypting the unpredictable code and storing the encrypted code in the internal memory protected from exterior interrogation. The service center generates the same encrypted code in response to knowledge of the displayed unpredictable code. Entry of the same encrypted code via a keyboard into the disabled equipment re-enables the same.

REFERENCES:
patent: 4139864 (1979-02-01), Schulman
patent: 4211919 (1980-07-01), Ugon
patent: 4267578 (1981-05-01), Vetter
patent: 4318005 (1982-03-01), Heckelman et al.
patent: 4347545 (1982-08-01), Weishaupt et al.
patent: 4471216 (1984-09-01), Herve
patent: 4484067 (1984-11-01), Obrecht
patent: 4575621 (1986-03-01), Dreifus

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