Method for generating a random number in a data processing system/and system for implementing the method
US5177790A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 9, 1991 |
| Grant date | Jan 5, 1993 |
| Priority date | — |
| Expiry date | Aug 9, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06Q20/40975
- WIPO fieldIT methods for management
- WIPO sectorElectrical engineering
Abstract
In a data processing system using portable objects (1) such as cards incorporating memory chips (11, 12, 13, 14, 15) and a processing circuit (10), where a first memory zone (11) is electrically erasable and writable at the request of the processing circuits in the object, random numbers are generated taking into account a first parameter taken from the first zone (11) and at least one second parameter written in a second, nonvolatile zone (12) of the object, the content of this second zone being modified each time the first zone is erased such that the combination of parameters is never identical following the various erase operations on the first zone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.