Method for enabling direct encrypted communication between two terminals of a mobile radio network, and corresponding station and terminal facilities
First Claim
1. A method of enabling encrypted communication to take place directly in a single hop or merely directly between two terminals of a mobile radio network by satellite and/or of a GSM/DCS type after a call has been set up by one of them via a fixed radio station of the network, wherein during a first encryption stage, after a calling subscriber has been identified by the network from a signed response provided by an individual identity card of said subscriber via the calling terminal with which said card is associated, on receiving a random number transmitted by the station to the calling terminal, a cipher key is simultaneously generated by the card associated with the calling terminal and by the network control structure for encrypting/decrypting data transmitted by radio link between said calling terminal and the station, said cipher key then being stored in a memory of the station, and wherein said cipher key is subsequently transmitted by the station to the called terminal while setting up a radio link between said station and said called terminal for the call requested by the calling terminal, said key being for encrypting/decrypting data interchanged with said calling terminal.
2 Assignments
0 Petitions
Accused Products
Abstract
A method for enabling encrypted communication to be performed directly in a single hop or merely directly between two terminals of a mobile radio network by satellite and/or of the GSM/DCS type, after one of said terminals has called via a fixed radio station of the network. After a first encryption stage, performed in conventional manner, a cipher key is simultaneously generated by the identity card associated with the calling terminal and by the network control structure for encrypting/decrypting data transmitted over the radio link between said calling terminal and the station. This cipher key is then stored in a memory of the station so as to be transmitted to the called terminal when a radio link is set up between said station and said called terminal for the call requested by the calling terminal, and the key is used for the purpose of encrypting/decrypting the data interchanged between the calling and called terminals.
71 Citations
10 Claims
- 1. A method of enabling encrypted communication to take place directly in a single hop or merely directly between two terminals of a mobile radio network by satellite and/or of a GSM/DCS type after a call has been set up by one of them via a fixed radio station of the network, wherein during a first encryption stage, after a calling subscriber has been identified by the network from a signed response provided by an individual identity card of said subscriber via the calling terminal with which said card is associated, on receiving a random number transmitted by the station to the calling terminal, a cipher key is simultaneously generated by the card associated with the calling terminal and by the network control structure for encrypting/decrypting data transmitted by radio link between said calling terminal and the station, said cipher key then being stored in a memory of the station, and wherein said cipher key is subsequently transmitted by the station to the called terminal while setting up a radio link between said station and said called terminal for the call requested by the calling terminal, said key being for encrypting/decrypting data interchanged with said calling terminal.
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6. A method of enabling encrypted communication between a calling terminal and a called terminal of a mobile radio network, after a call has been set up via a fixed radio station of the network, comprising the steps of:
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identifying a calling subscriber from a signed response provided to the network by the calling terminal with which said subscriber is associated; transmitting a random number from the station to the calling terminal; generating a cipher key, using the random number, simultaneously by the calling terminal and by a network control structure of said mobile radio network; storing said cipher key in a memory of the station; encrypting/decrypting, with said cipher key, data transmitted between said calling terminal and the station; transmitting the cipher key from the station to the called terminal; and encrypting/decrypting, with the cipher key, data interchanged between said calling terminal and said called terminal. - View Dependent Claims (7, 8, 9, 10)
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Specification