Telecommunications – Radiotelephone system – Security or fraud prevention
Patent
1997-07-07
2000-04-18
Hunter, Daniel S.
Telecommunications
Radiotelephone system
Security or fraud prevention
455411, 455 88, H04K 100
Patent
active
060525762
ABSTRACT:
The equipment comprises a radio terminal adapted to calls with a public mobile telephony network supporting voice transmission channels and data channels, and an extension unit which can be connected to a data interface of the terminal and allowing calls on the data channels of the network. This extension unit comprises a microphone, an earphone, a vocoder and a ciphering module. It has the same external appearance as a conventional mobile radio terminal. In a security call mode, the signal coming from the microphone of the extension unit is processed by the vocoder and then by the ciphering module in order to produce data sent to the data interface of the terminal, and the data received from the data interface of the terminal are processed by the ciphering module and by the vocoder in order to control the earphone of the extension unit.
REFERENCES:
patent: 5077791 (1991-12-01), Salihi
patent: 5524134 (1996-06-01), Gustafson et al.
patent: 5703950 (1997-12-01), Jovanovich et al.
patent: 5715522 (1998-02-01), Vimpari et al.
Cooke et al. "The use of smart cards in personal communication systems security", Proc. of the Conference on Telecommunications, Manchester, Apr. 18, 1993, pp. 246-251.
Hunter Daniel S.
Matra Communication
Tran Pablo N.
LandOfFree
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