Method and apparatus for universal and secure access to the telephone network

摘要

The method is implemented by a processor (7) which is linked to an integrated keyboard (1) and display (2), a radio call receiver (3) with its antenna (8), a dual-tone multiple-frequency signalling device (4), security logic (5) and a memory (6) for telephone numbers. Access to the network (12) via an acoustic coupler (9) in the mouthpiece of a standard handset (10) is secured cryptographically by an authentication algorithm using a secret key stored in an internal or external security module. The equipment can be worn like a wrist-watch or carried as a chip card or very small pocket calculator.