Cryptography – Communication system using cryptography – Data stream/substitution enciphering
Reexamination Certificate
2006-08-01
2006-08-01
Zia, Syed A. (Department: 2131)
Cryptography
Communication system using cryptography
Data stream/substitution enciphering
C380S029000, C380S044000, C380S259000, C380S277000, C380S030000, C713S150000, C713S156000, C713S189000, C726S022000, C726S023000
Reexamination Certificate
active
07085378
ABSTRACT:
The invention concerns a countermeasure method in an electronic component using a secret key K cryptographic algorithm with sixteen computing cycles to supply an encrypted message (C) from an input message (M), each cycle using first means TC0to supply an output information from an input information, Said method consists in applying by selection a sequence with the first means or another sequence with other means TC1, TC2to a group G1comprising the first three cycles at least and another group G4comprising the last three cycles at least. Whatever the sequence, the output result of the last cycle of each group is the same for the same input message (M).
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Yi, Xun et al., “A Method for Obtaining Cryptographically Strong 8×8 S-boxes”, IEEE Global Telecommunications Conference, Phoenix, Arizonia, Nov. 3-8, 1997, vol. 2, Nov. 3, 1997, pp. 689-693.
Benoit Olivier
Clavier Christophe
Buchanan & Ingersoll PC
GEMPLUS
Zia Syed A.
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