Security enhancement in a data processor through use of dynamic

Details Security enhancement in a data processor through use of dynamic Security enhancement in a data processor through use of dynamic

1990-03-13

1992-09-29

Tarcza, Thomas H.

Cryptography

Communication system using cryptography

Data stream/substitution enciphering

380 3, 380 25, H04L 900

Patent

active

051519380

ABSTRACT:
A descrambler for descrambling scrambled information signals through use of a predetermined decryption key. The processing means are adapted for processing data in accordance with a number of different data processing routines to descramble said scrambled information signals, including a routine for descrambling said scrambled information signals that utilizes said predetermined decryption key, and a routine for generating said predetermined decryption key. The processing means includes means for responding to an instruction for generating said predetermined decryption key by processing a first signal provided by the processing means with a second signal to generate said predetermined decryption key; and means for providing at least a portion of said second signal for processing with said first signal by retrieving a portion of said stored data from a portion of said memory means identified by a dynamic pointer contained in said instruction for generating said decryption key, with said retrieved data being data that is also used in a said data processing routine other than said routine for generating said predetermined decryption key.

REFERENCES:
patent: 4455602 (1984-06-01), Baxter, III et al.
patent: 4613901 (1986-09-01), Gilhousen et al.
patent: 4712238 (1987-12-01), Gilhousen et al.
patent: 4864615 (1989-09-01), Bennett et al.

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