Method for verification of integrity and decryption of an encrypted message, associated cryptomodule and terminal
US11533162B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 20, 2019 |
| Grant date | Dec 20, 2022 |
| Priority date | — |
| Expiry date | Jan 20, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/805
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method for verification of integrity and decryption of an encrypted message including ordered data blocks, the method performed by a cryptomodule and including storing or activating an integrity key; calculating an initial integrity code; generating a verification key and storing it; for each data block: storing the data block; updating an intermediate integrity code with the integrity key, the data block and the initial integrity code or the intermediate integrity code of the preceding data block; generating an authentication code using the verification key; deleting the data block; analysing the final integrity code; if the integrity is verified: storing or activating a decryption key specific to the encrypted message; for each data block: storing the data block; verifying the authenticity and the row of the data block using its authentication code; decrypting the data block with the decryption key; transmitting to the terminal the decrypted data block.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.