Cryptographic method of protecting an electronic chip against fraud
US7526648B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 7, 2002 |
| Grant date | Apr 28, 2009 |
| Priority date | — |
| Expiry date | Apr 7, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/56
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The present invention relates to a cryptographic method of protecting an electronic chip against fraud and a device including an electronic chip which is adapted to protect the electronic chip against fraud. The method includes: mixing some or all of the input parameters (Em) to supply an output data item E′=(e′1, e′2, . . . , e′n, . . . , e′N), changing the state of a finite state automaton from an old state to a new state as a function of the data item E′=(e′1, e′2, . . . , e′n, . . . , e′N), and calculating a certificate (S) by means of an output function having at least one state of the automaton as an input argument. The device includes: mixing means, a finite state automaton, and output means for calculating a certificate (S).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.