Method and device for carrying out a cryptographic calculation
US8199909B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 6, 2005 |
| Grant date | Jun 12, 2012 |
| Priority date | — |
| Expiry date | Jun 13, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/046
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A cryptographic calculation is carried out in an electronic component according to a specific cryptographic algorithm including at least one specified non-linear operation on blocks of data of k bits, k being a whole number of more than 2. Several blocks of masked intermediate data of j bits are generated from an initial block of data of k bits, j being a whole number that is smaller than k. Then a non-linear operation S is applied to at least one of the masked intermediate data blocks of j bits with the aid of a substitution table with 2 inputs producing a modified data block of j bits. The modified data block of j bits and at least some of the masked intermediate data blocks of j bits are combined to form a result block of k bits corresponding to the initial data block of k bits by means of a transformation including the specified non linear operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.