Process for digital signing of a document with a predetermined secret key
US11102012B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 22, 2018 |
| Grant date | Aug 24, 2021 |
| Priority date | — |
| Expiry date | Jun 29, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/16
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method for digital signing of a document using a predetermined secret key. An initial internal state is determined by application to a condensate of the document of a first white box implementation of generation of a main nonce; then a modular sum of the main nonce and of a predetermined constant. The method also determines a first internal state by application to the initial internal state of a first modular arithmetic operation, then of a modular product with exponentiation of the predetermined constant. The method then determines a second internal state by application to said condensate of a second white box implementation of generation of the main nonce; and a second modular arithmetic operation function of the first internal state, of the main signature nonce and of the secret key. It then generates a digital signature of the document from the first internal state and the second internal state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.