Thales

Sepideh Fouladgar

Patrick Duputz

Carlos Pinto

A method of detecting whether a packet from a plurality of packets transmitted by at least one transmitting station over a network has been played back is disclosed. Each packet includes a message and an identifier, the packets being successively transmitted over several consecutive time periods. The method includes receiving the packet by at least one receiving station and reading of the identifier of the received packet to obtain a received identifier, and consulting, by the receiving station, a database of identifiers already received to determine whether the received identifier has already been received. If the received identifier has not already been received, the method also includes updating the database to include the received identifier. The identifier includes an indicator of belonging to groups of packets.

Method for detecting the playback of a data packet

A method for the secure exchange of data over an ad-hoc network implementing an Xcast broadcasting service and an associated node are disclosed. The method includes providing a security graph for the network and a communication graph for the network, routing a data item between the sender node sending the data and each receiver node receiving the data along a secure route on the security graph. The method also includes generating, between one relay node and a subsequent relay node of the secure route, an appropriate message, containing the data protected in accordance with a security association shared between the relay node and the subsequent relay node. The method further includes routing the message from the relay node to the subsequent relay node along a communication route on the communication graph.

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Gennevilliers, France

Sepideh Fouladgar