Process and device for making secure a telephone link connecting

Details Process and device for making secure a telephone link connecting Process and device for making secure a telephone link connecting

1997-06-16

1999-10-05

Gregory, Bernarr E.

Cryptography

Cryptanalysis

380 21, 380 28, 380 29, 380 30, 380 46, 380 49, H04L 900, H04L 906, H04L 930

Patent

active

059636440

ABSTRACT:
A telephone link comprises two network terminals to which two subscriber sets are respectively connected, two subscriber lines respectively linking the two network terminals to two line terminals respectively located at two local switching centers mutually linked by a switched telephone network, the network terminal and the line terminal of at least one of the subscriber lines being respectively equipped with one network encryption/decryption means and with one line encryption/decryption means wherein information exchanged between the two subscriber sets is encrypted, at least on one of the two subscriber lines which is connected to the respective network and line encryption/decryption means, on the basis of at least one encryption key generated by the network encryption/decryption means or by the line encryption/decryption means, and varying temporally in pseudo-random fashion by the network encryption/decryption means or by the line encryption/decryption means, the information exchanged between the two subscriber sets being transmitted in clear at least between each network terminal and the corresponding subscriber set.

REFERENCES:
patent: 4182933 (1980-01-01), Rosenblum
patent: 5278907 (1994-01-01), Snyder et al.
IBM Technical Disclosure Bulletin, vol. 34 No. 1, Jun. 1991, New York, US pp. 331-338, XP000210235 Anonymous: "Method of Providing Encryption/Decryption for integrated Services Digital Network Telecommunications."
International Switching Symposium 1987: `Innovations in Switching Technology`. Proceedings (Cat. No. 87CH2431-5), Phoenix, AX, USA, Mar. 15-20, 1987, New York, NY, USA, IEE, USA, pp. 863-869 vol. 4 XP0002017713 O'Higgins B et al: "Encryption and ISDN-a natural fit".
ICASSP-94. 1994 IEEE International Conference on Acoustics, Speech and Signal Processing (Cat. No. 94CH3387-8), Proceedings of ICASSP '94. IEEE International Conference on Acoustics, Speech and Signal Processing, Adelaide, Sa Australia, 19-22 Apr. 1, ISBN 0-7803-1775-0, 1994, New York, NY, USA, IEEE, USA, pp. II/425-8 vol. 2, XP00528508 diez-del-rio 1 et al: "Secure speech and data communication over the public switching telephone network".

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