| 摘要 |
<p>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 TC<SUB>0 </SUB>to 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 TC<SUB>1</SUB>, TC<SUB>2 </SUB>to a group G 1 comprising the first three cycles at least and another group G 4 comprising 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).</p> |
