Secure mobile telephone system

Details Secure mobile telephone system Secure mobile telephone system

1980-03-14

1983-10-18

Cangialosi, Sal

Telecommunications

Use or access blocking

179 15R, 178 2216, H04K 100

Patent

active

044110170

ABSTRACT:
A communications system including a central station and a plurality of remote stations, for example, a mobile telephone system, is disclosed in which communications channel establishing signalling transmissions between the central and remote stations are conducted in a clear (unenciphered) mode and subsequent voice transmissions between the central and remote stations are conducted in a secure (enciphered) mode. Each remote station has a unique code assigned thereto which is used by it to at least decipher incoming enciphered voice transmissions from the central station and by the central station to encipher outgoing voice transmissions to the remote station. The unique code may also be used by the remote station to encipher outgoing voice transmissions and by the central station to decipher incoming voice transmissions from the remote station. Alternatively all remote station outgoing voice transmissions may be enciphered with a code common to all remote stations which code is used by the central station for decipering incoming voice transmission. The central station can automatically, or in response to a specific request for secure service, switch its equipment to the secure mode upon completion of communications channel establishing signalling transmissions between it and a remote station and can control remote station switching to the secure mode by sending an enciphered voice transmission to the remote station which responds to receipt thereof by switching to the secure mode.

REFERENCES:
patent: 3610828 (1971-10-01), Girard et al.
patent: 3651404 (1972-03-01), Rollins
patent: 4027243 (1977-05-01), Stackhouse et al.
patent: 4167700 (1979-09-01), Coe
patent: 4182933 (1980-01-01), Rosenblum
patent: 4222115 (1980-09-01), Cooper et al.
patent: 4231114 (1980-10-01), Dolikian
patent: 4238853 (1980-12-01), Ehrsam et al.
patent: 4264782 (1979-06-01), Konheim
"A Digitally Encoded Voice Encryption System", Bailey, Harris Corporation, 27 Annual Conference IEEE Vehicular Technology Group, Mar. 16-18, 1977, pp. 8-11.

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