Semiconductor memory device having copy protect function and met

Details Semiconductor memory device having copy protect function and met Semiconductor memory device having copy protect function and met

1997-05-20

2000-01-11

Cangialosi, Salvatore

Cryptography

Cryptanalysis

H04L 900

Patent

active

060144432

ABSTRACT:
Cryptographic key data and data subjected to an operation by use of the cryptographic key data are previously stored in a memory cell array. A memory cell in which the cryptographic key data is stored is accessed and latched and the cryptographic key data is latched in a latch circuit before read out data from the memory cell array. After this, the latched data and data output from a sense amplifier are subjected to an operation by an arithmetical circuit to decode the data and the result of the operation is output as readout data.

REFERENCES:
patent: 5563945 (1996-10-01), Gerceki
patent: 5890199 (1999-03-01), Downs

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