Schlumberger Systemes

Solaic

Axalto S.a.

Soliac

Fabien Thiriet

A method for loading computer programs into a portable object memory, in particular a chip card, from one or several transmitting devices EM, . . . EMj, . . . EMp, p being a whole number. The computer program is divided into n blocks BLK, . . . BLKi, . . . BLKn, n being a whole number greater than. Information I(n) representing a number of blocks to be loaded is transmitted to the portable object. The blocks BLK, . . . BLKi, . . . BLKn are loaded into the portable object memory, and each block BLKi loaded in the portable object is counted, restarting from the last block during re-loading, to avoid restarting from the beginning.

Loading computer programs in blocks

A mobile apparatus includes a cellular telephone and a subscriber identification module (&ldquo;SIM&rdquo;). SIMs include an interpreter written in a computer language. A game program, which is written in the same computer language, is loaded into the memory of the SIM and is interpreted by the SIM's interpreter. The game program is then executed by the cellular telephone so that the game can be played.

Mobile communications apparatus adapted for executing computer game programs

An IC card includes card including a memory containing files classified in a tree structure of various levels, each file having an associated access path. Each file is physically located in the memory independently of its location in the virtual tree structure, and contains information specifying the full access path associated with the file.

Integrated circuit card comprising files classified in a tree structure

The security method is associated with an authentication method comprising steps of obtaining a calculated result from a random number subjected to a secret key algorithm, the security method includes steps of calculating a test result from a reference random number subjected to the secret key algorithm, of comparing the test result with a reference result, and of ensuring that the calculated result is transmitted only when the test result is identical to the reference result.

Security method for making secure an authentication method that uses a

A program is made secure relative to a CPU by storing in a first memory zone a series of predetermined-address functions that are directly executable by the CPU, by write protecting said first memory zone, and by storing the program in a second memory zone in the form of a series of instructions that are executable within the second memory zone or that activate functions contained in the first memory zone.

Method of implementing a secure program in a microprocessor card, and a

For a memory card that includes memory blocks containing reliability parameters (P.sub.1, P.sub.2, and P.sub.3) and respective reliability weights (PF.sub.1, PF.sub.2, and PF.sub.3), for the parameters, the method comprises the following steps:

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Orleans, France

Fabien Thiriet