Method for enabling direct encrypted communication between two t

Details Method for enabling direct encrypted communication between two t Method for enabling direct encrypted communication between two t

1998-05-20

2000-10-24

Swann, Tod R.

Cryptography

Cellular telephone cryptographic authentication

380248, 380249, 380259, 380270, 380273, 380283, 380 44, 455410, 455411, H04K 100

Patent

active

061378852

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.

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