Thales

Philippe Painchault

François Delaveau

Eric Garrido

Sandra Marcello

Sandrine Agagliate

Paul Gompel

Adrien Duprez

Jean Martinelli

Sonia Belaid

Christiane Kameni

Jean-François Wiorek

Stéphane Solier

A method and system for testing the cryptographic integrity of data m comprises at least the following elements: a module transmitting a message M, said module comprising a memory for storing the parameters used to execute the steps of the method, such as the key, the public data, a transmission medium, a receiver module also comprising storage means for storing at least the same parameters as in transmission. The system may comprise storage means for storing confidential data such as the secret keys, a processor suitable for executing the steps.

Method and system making it possible to test a cryptographic integrity of an error tolerant data item

A method for generating cryptographic half-keys makes it possible to generate n pairs (K, K), 1&#x2266;i&#x2266;n, of cryptographic half-keys, each of said pairs making it possible to reconstruct an access key Kspecific to a secure apparatus, said method comprising at least the following steps: generating and storing, with the help of a management center distinct from said apparatus, a first series of n half-keys Kon a recording medium; supplying the apparatus with said recording medium so as to generate, with the help of said local key Kand of the n half-keys Kstored on said medium, a second series of n half-keys Kmaking it possible to form said n pairs (K, K). The method applies notably to the creation of several keys for access to a secure apparatus.

Method for generating cryptographic half-keys, and associated system

Method and system are disclosed for managing erratic interruptions in a transmission system where the messages to be transmitted are composed of data packets and are expressed by means of a polynomial of degree t&#x2212;1. The senders and the receivers share information making it possible to reference the data packets. In the course of the transmission of a message represented by a polynomial P, at least t points Ai are generated and P(Ai) of the polynomial P is evaluated, with t' greater than or equal to t. The evaluations P(Ai) are transmitted of the t&#x2032; points to the receiver or receivers concerned, with information allowing the receivers to detect the transmission errors. Each receiver verifies that it has received t valid evaluations, that is to say free of transmission errors, uses the information referencing the packets and the t valid evaluations P(Ai) of the polynomial to determine the points Ai, and on the basis of the P(Ai) and of the Ai and determines the polynomial P used and on the basis of said polynomial deduces the message therefrom.

Method and system making it possible to manage erratic interruptions in a transmission system

A method is disclosed for the transmission of information. The information contains n information carrier cells, with n being greater than or equal to 2. The method of linear encoding for erratic transmission includes at least the following steps: generating a mask {Mi}of n cells corresponding to n information carrier cells; making a linear combination of at least all the n cells with the n cells of the generated mask to obtain a resulting word; performing a linear operation on the n cells of the resulting word to obtain a cell Bto be transmitted.

Method of linear encoding for erratic transmissions

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Asnieres, France

Philippe Painchault