Trusted Logic

Trusted Logic Mobility

Trusted Logic Mobility (Sas)

Trustonic Sas

Axelle Apvrille

Alexandre Frey

Dominique Bolignano

Christophe Colas

The invention relates to a system and method for making data secure. The inventive system is characterized in that it comprises:&#x2014;a monotonic counter;&#x2014;a computational entity;&#x2014;a physical data medium comprising one or a plurality of data blocks, a first master block comprising the last value recovered from the monotonic counter, an identifier of the last data block written on said medium, a first authentication code guaranteeing the authenticity of the written data block or blocks, a second authentication code calculated from the last written data block, said data being fixed at a neutral value, and a third authentication code guaranteeing the authenticity of the first master block, and a second master block forming a replica of the first master block; and&#x2014;an authentication key. The invention is used, in particular, to make data secure against playback and sudden interruptions in service in embedded systems.

System and method for securing data

According to the inventive method, the chip card, a counting function (FC), a counter (Cpt) and a private key (Cf) stored in the write-only part of the memory region are stored in a persistent memory, the counter and the private key (Cf) being accessible only by the counting function (FC). When the chip card receives a counter request emitted by an requesting entity (ER), the counting function (FC) performs a modification of the counter (Cpt) and a calculation of a signature, and sends a response to the applicant entity (ER). When the on-board system receives the response to the counter request, the signature contained in the response is checked.

Method for creating a secure counter on an on-board computer system comprising a chip card

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Roquefort les Pins, France

Axelle Apvrille