Method for generating a random number in a system with portable electronic objects, and system for implementing the method
US5365466A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 10, 1994 |
| Grant date | Nov 15, 1994 |
| Priority date | — |
| Expiry date | Feb 10, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06Q20/40975
- WIPO fieldIT methods for management
- WIPO sectorElectrical engineering
Abstract
A method for generating a random number in a system utilizing portable objects, such as cards with electronic memories and data processing circuits, wherein the data processing circuits (TC) of the portable object are operable to generate a random number required for data processing, when the portable object is connected to a processing apparatus of the system. A calculation program recorded in the circuits of the portable object is executed taking into account parameters memorized in the memory (MC) of the object. At least, the following parameters are taken into account each time a random number is requested during a session: a first parameter (PA1) constituted by the datum of a field (RB) of a volatile memory zone of the object, the datum of the field being modified following each request for a random number during one session; a second parameter (PA2) which is modified at least once during each session and is preserved between the end of one session and the next session; and a third parameter which is constituted by a datum specific to the portable object.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.