Device and method to compute a block cipher
US10790962B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 31, 2018 |
| Grant date | Sep 29, 2020 |
| Priority date | — |
| Expiry date | May 31, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/24
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Some embodiments are directed to a cryptographic device (100) arranged to compute a block cipher on an input message (110). The device computes a plurality of intermediate block cipher results by computing and re-computing a first intermediate block cipher result (151) of the plurality of intermediate block cipher results by applying the plurality of block cipher rounds sequentially to the input message followed by one or more additional block cipher rounds. A plurality of averaging functions are applied to the plurality of intermediate block cipher results, the results of which are added, after which the inverse of the one or more additional block cipher rounds is applied.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.