Methods for protecting substitution operation using substitution table against a side-channel analysis
US10581588B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 28, 2017 |
| Grant date | Mar 3, 2020 |
| Priority date | — |
| Expiry date | May 8, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/12
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method for executing by a circuit a substitution operation such that an output data may be selected in a substitution table using an input data as an index. The substitution operation may be performed using a new masked substitution table. The input data may be combined by XOR operations with a new value of a first mask parameter, and the output data may be combined by XOR operations with a new value of a second mask parameter. The new masked substitution table may be generated by computing the new value of the first mask parameter by applying XOR operations to a previous value of the first mask parameter and to a first input mask, computing the new value of the second mask parameter by applying XOR operations to a previous value of the second mask parameter and to a second input mask, and generating the new masked substitution table using a previous masked substitution table and the first and second input masks.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.