Method for generating a random number in a system with portable

Details Method for generating a random number in a system with portable Method for generating a random number in a system with portable

1994-02-10

1994-11-15

Nguyen, Long T.

Boots, shoes, and leggings

380 23, 380 28, G06F 738, H04K 100

Patent

active

053654668

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.

REFERENCES:
patent: 4935962 (1990-06-01), Austin
patent: 4944008 (1990-07-01), Piosenka et al.
patent: 4969188 (1990-11-01), Schobi
patent: 4974193 (1990-11-01), Beutelspacher et al.
Computer Network & ISDN Systems, vol. 14, Nos. 2-5, 1987, pp. 389-395; Ph. Van Heurck: "Trasec: National security system for EFTs in Belgium".

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