France Telecom

Orange

France Telecom Sa

Patrick Battistello

Henri Gilbert

Yvon Gourhant

Stéphane Gorse

Andre Jaillard

Quentin Loudier

Sébastien Cubaud

A method for secure communications in a telecommunications network is disclosed. The network comprises a group of servers S, referred to as Authorization Servers. For a transaction between an entity A and an entity B of this method comprises: a) entity A sends to one of the Authorization Servers San authorization request; b) the entity A declares to the Authorization Server Sits intention to communicate with entity B and the Authorization Server Sdetermines an individual secret key Kwhich it shares with entity B; c) the Authorization Server Sgenerates a session key Kand sends the session key Kto entity A; d) the Authorization Server Sgenerates a transaction identifier IDTR; e) the authorization server Ssupplies entity B the transaction identifier IDTR; f) using this transaction identifier IDTR, entity B checks the validity of the transaction, and g) entity B generates the session key K.

Method and devices for secure communications in a telecommunications network

A secure communications method is provided for use in a telecommunications network, wherein a transaction between an entity A and an entity B of the network comprises: entity A sending an authorization request to an Authorization Server S, in which request the entity A identifies itself and authenticates itself; the entity A declares to the Authorization Server its intention to communicate with a certain entity B; the Authorization Server determines a secret key that it shares with the entity B; the Authorization Server generates a session key and sends it to the entity A; the session key being a one-way function of the secret key and also being a function of an integer (transaction number) allocated to the transaction; the Authorization Server also generates a transaction identifier that is a function depending at least on the transaction number in non-invertible manner.

In a network in which to set up a call to a called endpoint a calling endpoint sends (4) the called endpoint a call set-up message including a source information element identifying the calling endpoint and a destination information element identifying the called endpoint, the call is set up on condition that the call set-up message contains a first token value (J) that corresponds to a second token value given by an equation that includes said source information element, said destination information element, and a random information element generated by the network to be associated secretly with the first token value in the network.

Mechanism for protecting H.323 networks for call set-up functions

In an audiovisual communications network, a first endpoint exchanges with a control element messages transmitting parameters registered or to be registered in the control element to enable the first endpoint to communicate with a second endpoint registered with the control element. The communications network is made secure by a method that includes an observation step for detecting whether a set of parameters among the parameters transmitted in a message is inconsistent with a current state of the addressee of said message.

Method of making an audiovisual communications network secure

The present invention concerns a method of protecting the transmission of cells in a telecommunication system, the method consisting, on the transmitter side, of simultaneously transmitting two identical flows of cells on two distinct physical links and, on the receiver side, of receiving each of the two flows of cells respectively transmitted on the said two links and selecting one of them. The method further consists, on the transmitter side, of inserting, regularly in each of the flows, cells serving as markers and thus delimiting blocks of cells or sets of blocks of cells, and, on the receiver side, of selecting, block after block or group of blocks after group of blocks, the block or group of blocks from the flow of cells which has the fewer transmission errors compared with the block or group of blocks of the same order number in the other flow.

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Perros-Guirec, France

Patrick Battistello