Gemalto Sa

Gemplus

Thales Dis France Sa

Pascal Guterman

David Naccache

Pierre Girard

Jean-Luc Lesur

Philippe Proust

Nathalie Feyt

Pascal Moitrel

Laurent Sustek

Ludovic Rousseau

Mireille Pauliac

Cedric Cardonnel

Christophe Bidan

Laurent Bonnet

Sébastien Petit

Christophe Clavier

A method of protecting a telecommunication terminal having a chip-card-type personal component which is required for telecommunication network access. The terminal includes a processing unit, at least one operating memory element containing the information necessary to the operation of the terminal, i.e. a terminal operating program, and the data necessary to the program. The method involves: a) encrypting the contents of the operating memory element of the telecommunication terminal using a pre-determined key K which is necessary for decryption; and b) allowing the terminal to commence decryption once the terminal has been started with a start-up program that is saved in a secure memory element and once the key for decryption has been calculated by same.

Method of protecting a mobile-telephone-type telecommunication terminal

A method for preventing secret code manipulation in a data processing device, such as a smart card, to which a presented code is applied. Prior to implementation of a code transforming function in the processing device, the secret code is transformed into a transformed secret code in the card. For each use of the card, the presented code is transformed into a transformed presented code in accordance with the implemented transformation function. A comparison of the transformed secret code with the transformed secret code in the card is then performed.

Access control to data processing means

An entity of the smart card type has an application layer linked to a communication protocol layer. A time manager containing a timer interfaces with the protocol layer. The time manager substantially periodically constructs waiting time extension requests transmitted to a terminal through the protocol layer as long as data are being processed in the application layer. The application layer is thus freed from any time constraint.

Time management at communication protocol layer for a smart card-type device

In a data processing device, a first key is produced based on a secret key so that the latter is never used in a clear form. In a preliminary step, the secret key and a random number are applied to a function producing a first key. The first key and the random number are pre-stored in the device. For each data processing, the first key and another random number are applied to another function to produce a second key, and the second key and the stored number are applied as inverse of the function to produce a third key used for processing the data. The device can be a smart card and the data the confidential code presented to the card.

Data processing with a key

The invention relates to a storage system including at least one non-volatile memory containing information likely to be updated, and more particularly, to storage supports such as chip cards. The invention likewise relates to a process of management of the memory. According to the invention, the system includes a memory manager that is able to displace all or a portion of the contents of the memory respectively over all or a portion of the memory, in order to limit the attrition of memory cells due to the frequent updating of certain data.

Storage system including means for management of a memory with anti-attrition, and process of anti-attrition management of a memory

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Roquevaire, France

Pascal Guterman