Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1986-10-06
1988-07-19
Cangialosi, Salvatore
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
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
Kaish Norman
Traub Gilbert
Cangialosi Salvatore
International Electronics Technology Corporation
Lewis Aaron J.
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