Countermeasure method in an electronic component using a secret key cryptographic algorithm
US7085378B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 15, 1999 |
| Grant date | Aug 1, 2006 |
| Priority date | — |
| Expiry date | Sep 15, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2207/7219
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
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 TC0 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 TC1, TC2 to a group G1 comprising the first three cycles at least and another group G4 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).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.