Oberthur Technologies

Thomson Licensing S.a.

Jean-Bernard Fischer

Christophe Giraud

Hugues Thiebeauld De La Crouee

Paul Dischamp

Emmanuel Prouff

Mario De Vito

Théophane Lumineau

V&eacute;ronique Pla

A method for making secure execution of a computer program includes a set of at least one instruction, characterized in that it includes: a first step which consists in calculating and storing, prior to execution of the computer program, a first signature representing the expected execution of the set of instructions; a second step which consists in calculating and storing, during execution of the set of instructions, a second signature representing the execution of the set of instructions; and a step which consists in detecting an anomaly of execution of the set of instructions from the first and second signatures.

Method and device for making secure execution of a computer programme

A method for making secure execution of a computer program includes the following steps: stacking a predetermined value in a pile of instructions of the program; and stack popping the pile, the stack popping step being adapted, as the case may be, to enable detection of an anomalous execution.

Method for making secure execution of a computer programme, in particular in a smart card

A method for creating a group signature of a message to be implemented by a member of a group in a system, the system including a trust authority, the group including at least the member provided with a secure portable electronic entity including storage elements and computing elements wherein are implanted a cryptographic algorithm. The method includes the following steps: generating via the computing elements a signature of the message using a private key common to the members of the group and integrating a data identifying the group member and a temporal data representing a temporal information of the member's membership to the group and of the date of the signature of the message, the private key common to the members of the group, the identifying data and the temporal data being stored in the storage elements.

Method and device for creating a group signature and related method and device for verifying a group signature

An electronic unit includes a processor (P), an input-output device () and a cryptographic device (). The unit is directly connected by two-way data transmission () set up between the input-output device and the cryptographic device, the electronic unit being integrated in a microcircuit card.

Electronic unit provided in a microcircuit card and including cryptographic means for high-speed data processing

An exchange of information between a communication entity e.g. a mobile telephone and the operator server upon which it is dependent, in order to carry out authentication operations by exchanging keys and using cryptography algorithms. According to the invention, an algorithm is used, comprising: algorithmic treatments using, as input data, all or part of a random number and operating keys derived from two keys, and a combined treatment using data derived from algorithmic treatments in order to provide results to enable the linkage.

Growing community of inventors

Le Kremlin Bicetre, France

Jean-Bernard Fischer