Crytographic system and process and its application
US5001753A · kind A · utility
54Cited by
4References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 7, 1988 |
| Grant date | Mar 19, 1991 |
| Priority date | — |
| Expiry date | Mar 7, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2221/2107
- WIPO fieldIT methods for management
- WIPO sectorElectrical engineering
Abstract
The subject of the present invention is a cryptographic system, having two inverse permutations, which can be implemented in a (micro) computer whose data processing resources are relatively limited. The two inverse permutations are processed with one and the same table, and the data zones, before and after permutation, occupy only one and the same memory zone. Applied to the DES cryptographic system, this can in particular be implemented in the memory card for the purpose of ensuring the security of transmissions between the card and a communication system; in particular the card reader of this system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.