Information security – Prevention of unauthorized use of data including prevention...
Reexamination Certificate
2006-06-27
2006-06-27
Barrón, Jr., Gilberto (Department: 2134)
Information security
Prevention of unauthorized use of data including prevention...
C713S189000
Reexamination Certificate
active
07069593
ABSTRACT:
The present invention relates to an integrated circuit device containing a memory area, which comprises, on the one hand, a data memory and a program memory, and on the other hand, a program having N code blocks Bi (i=1, . . . , N). It also relates to a method for making such a device secure. The present invention is characterized in that the memory area has M replicas Cj (j=1, . . . , M) of x program code blocks Bi (x=1, . . . , N), which replicas reside at different addresses in said memory area, and in that said device has selection means for randomly selecting one replica Cj of at least one of the x blocks Bi, as a block replica to be used when executing said program. In particular, the present invention can be applied to smart cards.
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Kuhn et al., “Design Principles for Tamper-Resistant Smartcard Processors,” Proceedings of the USENIX Workshop on Smartcard Technology (Smartcard '99), May 1999.pp. 1-12.
Axalto S.A.
Barrón Jr. Gilberto
Brown Christopher J.
Cohen & Pontani, Lieberman & Pavane
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