Secure dialing in mobile telephone system

Details Secure dialing in mobile telephone system Secure dialing in mobile telephone system

1996-08-13

1999-08-17

Patel, Harshad

Cryptography

Key management

Having particular key generator

370329, H04L 900, H04Q 700

Patent

active

059405155

ABSTRACT:
A cellular telephonic communication system is provided with privacy in the transmission of a dialed number from a mobile station to a base station. This is accomplished by transmitting from the base station a modified origination message followed by an origination continuation message. In the origination message, the dialed number is omitted. The origination message is transmitted by the access channel, and includes a control bit indicating that the origination message is incomplete and is to be followed by an origination continuation message. The base station responds by assigning forward and reverse traffic channels to the mobile station. The mobile station then employs the reverse traffic channel to transmit the dialed number to the base station. In the traffic channels, the private long code mask is employed for spreading the spectrum of the reverse traffic channel data which includes the dialed number. Thereby, an intruder listening to the telephonic communication cannot determine the identity of the called party because the intruder does not know the spreading code used.

REFERENCES:
patent: 5638412 (1997-06-01), Blakeney, II et al.
patent: 5673259 (1997-09-01), Quick, Jr.
patent: 5722067 (1998-02-01), Fougnies et al.
patent: 5794156 (1998-08-01), Alanara
patent: 5822359 (1998-10-01), Bruckert et al.

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