Secret code security access to data processing means
US7434070B2 · kind B2 · utility
3Cited by
7References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 21, 2001 |
| Grant date | Oct 7, 2008 |
| Priority date | — |
| Expiry date | Sep 6, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07F7/1025
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Access control to data processing means, such as a smart card, is made secure by simulating a comparison block by block of part of a secret code with part of a presented code through a block-by-block comparison of part of the presented code and part of a determined number when the presented code is found to be erroneous. Each time the card is used, a constant number of operations are applied to the presented code and at least for part of the secret code, and at most for a complementary part to the determined number, thus avoiding different signatures of power consumption for different presented codes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.