Safety device against the unauthorized detection of protected da

Details Safety device against the unauthorized detection of protected da Safety device against the unauthorized detection of protected da

1989-11-03

1990-06-05

Buczinski, Stephen C.

Cryptography

Cryptanalysis

380 6, 380 50, 380 24, 365 49, 365120, 235379, 235380, H04L 900

Patent

active

049320530

ABSTRACT:
The disclosure concerns the safety of the confidential information contained in integrated circuits. In a certain number of integrated circuit applications and, more particularly, in the circuits contained in cards known as "chip cards", it is necessary to prohibit access by unauthorized persons to confidential information stored in a memory of the circuit. To prevent the fraudulent practice of examining the current consumption at the terminals of the integrated circuit during an operation of reading or writing in the memory, a protection circuit is used. This protection circuit actuates the simulation, according to a pseudo-random sequence generated by a generator, of current consumption values identical to those of real memory cells.

REFERENCES:
patent: 4723224 (1988-02-01), Van Hulett et al.

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