Block cryptographic method for encrypting/decrypting messages and cryptographic devices for implementing this method
US11418321B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 1, 2015 |
| Grant date | Aug 16, 2022 |
| Priority date | — |
| Expiry date | Dec 1, 2035 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY04S40/20
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A block cipher method and apparatus using round repetition for providing, from a plaintext message, a ciphertext message and a global tag is disclosed; the plaintext message is converted into a plurality of ordered plaintext blocks which are successively processed during a round for computing: a cryptogram by encrypting input data using a single cryptographic key, said cryptogram comprising a first segment and a second segment; a ciphertext block by performing a first operation using, as operands: said first segment said current plaintext block and said second segment; at each next round said input data is newly determined based on the current ciphertext block and an updated reproducible data; the ciphertext message is determined by concatenating the ciphertext blocks and the global tag by a second operation using computed authentication local tags as operands.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.