Integrated circuit with an access-controlled data memory

Details Integrated circuit with an access-controlled data memory Integrated circuit with an access-controlled data memory

1989-09-26

1991-05-07

Buczinski, Stephen C.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 4, 380 24, 380 50, 235379, 235380, 235382, 34082531, 34082534, G06F 1214

Patent

active

050143115

ABSTRACT:
A method for protecting secret code data stored in a data memory from analysis includes forming conclusions as to the content of the memory from signals at outputs of the memory, and limiting transfer of the code data from the data memory into a peripheral logic to a predetermined time period and an apparatus for carrying out the method.

REFERENCES:
patent: 3906460 (1975-09-01), Halpern
patent: 4408119 (1983-10-01), Decavele
patent: 4421977 (1983-12-01), Kittredge
patent: 4484067 (1984-11-01), Obrecht
patent: 4525599 (1985-06-01), Curran et al.
patent: 4593384 (1986-06-01), Kleijne
patent: 4716586 (1987-12-01), Bauer

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