Gemplus

Gemalto Sa

Gemplus Card International

Thales Dis France Sa

Charles Coulier

Karine Villegas

Nicolas Roussel

Edouard M Gordons

Ali Zeamari

Georges Grimonprez

Nabil Hamzi

Philippe Brun

The present invention relates to a method to generate prime numbers on board a portable device, said method comprising the steps of, each time at least one prime number is requested:

Method for on-board prime number generation

Application protocol data units are conveyed in a universal serial bus so that a portable electronic object such as a smart card can be recognized by a terminal, such as a micro-computer, as being a peripheral. The header and the data field, when such a data field exists, of each command are encapsulated in data fields of data packets of respective downlink transactions. The data field, when such a data field exists, and the trailer of each response are encapsulated in the data packet data field of at least one uplink transaction. By means of this bus link, the data rate between the terminal and the electronic object is higher, and a plurality of portable electronic objects can be connected to the terminal.

Conveying protocol units for portable electronic objects via a protocol for microcomputer peripherals

The invention provides a method for reducing occupancy of descriptors used for protecting files in storage. The method includes separating the functions files are going to be subjected to from the protection modes to which said functions subscribe. The descriptors comprise a number of octets equal to the number of protection modes proposed. The bits of these octets, depending on whether they are active or inactive, refer to function memory words whose number is directly equal to the number of active bits in the mode memory words. The function memory words comprise references to secret codes to be used for implementing the desired security functions.

Secure memory management method

Microprocessor-based memory card that limits memory accesses by

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Roquevaire, France

Charles Coulier