Method for cryptographic data processing, particularly using an S box, and related device and software
US8473751B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 13, 2007 |
| Grant date | Jun 25, 2013 |
| Priority date | — |
| Expiry date | Dec 31, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/046
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method for data cryptographic processing, that is implemented by an electronic entity and includes the conversion of input data (M′i−1), masked by an input mask (X), into output data, the conversion using a conversion table (S), and the method including the following steps: for at least one plurality of possible values (A) for the input mask (X), transferring the output value of the conversion table (S) corresponding to the masked input data (M′i−1) converted by the application of an unmasking operation using the possible value (A), into a table (T) at a position corresponding to a determined value (0) masked by the input mask (X) and converted by the application of an unmasking operation using the possible value (A); determining the output data using the value located in the table (T) at the position corresponding to the determined value (0).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.