Linear conversion circuit and encryption circuit
US7499543B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 9, 2004 |
| Grant date | Mar 3, 2009 |
| Priority date | — |
| Expiry date | Jun 5, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/24
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A data processing method for specifying linear conversion for making the number of active S-box maximum, wherein a plurality of linear conversion candidates satisfying a restriction on a circuit for realizing linear conversion candidates are specified among the plurality of linear conversion candidates, linear conversion processing is performed based on a plurality of input data on each of the specified linear conversion candidates, a minimum value of the number of zeros arisen in processing results thereof (a so-called active S-box) is obtained, a linear conversion candidate making the minimum value largest is specified, and a linear conversion portion is configured based on the specified linear conversion candidate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.