Orange

Mohamed Sabt

Mohammed Achemlal

Mouhannad Alattar

The invention relates to a method for securing a contactless service transaction, said service () being stored in the mobile terminal (), said transaction involving the mobile terminal, a contactless reader () and a remote server (), said server storing at least one piece of data and/or sensitive function of the service, said terminal comprising a security module (), said method being characterised in that the terminal also stores a contactless security application () and that it comprises: receiving (E) a first value (&#x3b1;) for determining a session key; receiving (E) a second value for determining a session key (&#x3b2;) and a first one-time password (OTPin); sending (E) the second value for determining a session key and a message (MAC) for authenticating at least the first password, intended for being verified by the reader, said first and second determination values being used to calculate (E, E) a session key (K) intended for being used to secure the exchanges.

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Caen, France

Mohamed Sabt