The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 15, 1994
Filed:
Feb. 10, 1994
Michel Hazard, Mareil sur Mauldre, FR;
Bull CP8, Trappes, FR;
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.