Method and device to increase the protection of a chip card
US5477039A · kind A · utility
27Cited by
2References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 14, 1993 |
| Grant date | Dec 19, 1995 |
| Priority date | — |
| Expiry date | Dec 14, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2207/7219
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The method is designed to increase the protection of a microcircuit-based memory card comprising at least one memory coupled to a data-processing element. When said data-processing element receives a command by a data signal external to the card, said method consists in making said data-processing element emit a ratification signal at an instant that is deferred, with respect to the instant at which its emission was prompted by the data signal, by a duration that is randomly variable in time. The disclosed method can be applied to microcircuit-based memory cards.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.