France Telecom

La Poste

France Telecom Etablissement Autonome De Droit Public (centre National

Patrick Remery

Jean-Claude Pailles

Jacques Traore

Aymeric De Solages

Marc Girault

Francoise Vallee

Bernard Darbour

Françoise Vallee

A process for managing an electronic transaction with a trader by use of a microprocessor chip card and of a reading terminal able to interact with the card. The card performs a first comparison where it compares a transaction amount with a first threshold value and instigates a bearer authentication procedure when this amount is above the first threshold. When the amount of the transaction is below the first threshold, the chip card performs a second comparison where it compares with a second threshold value an incremented value of a first counter. The first counter being an aggregate of small amounts counter and being successively incremented by values of amounts of transaction in cases where the amounts are below the first threshold. A procedure for authenticating the bearer of the card is instigated by the card depending on the result of this second comparison.

Process for managing an electronic transaction by chip card terminal and chip card implementing this process

The transaction is made between an object and a terminal. According to the invention, an authentication value is inserted in the object which is a digital signature appearing on an identifier of the object. Each object also has a diversified key created from a base key diversified by the identifier. The terminal can thus authenticate the identifier and check that the debit has actually been made. Application to electronic payment.

Method for secure electronic transaction and corresponding system

Method for carrying out an electronic transaction using several signatures. In the present invention, entities (or actors) are spread over a communication network and share keys. A message is encapsulated inside several cryptograms, and intermediate entities progressively decapsulate the cryptograms that they receive. The invention is applicable to all electronic transactions, in particular to 'electronic wallet' applications.

Method for carrying out an electronic transaction using several signatures

Method for performing a double-signature secure electronic transaction

A process for exchange of rights between microprocessor cards, wherein multiple keys (K1, K2, . . . ) and varied keys (Ka5, Kb3) are used. A card to be debited calculates a voucher with varied key (Ka5) that the card to be credited reconstitutes. The process has application to electronic payment.

Process for exchange of rights between microprocessor cards

Growing community of inventors

Caen, France

Patrick Remery