Communication system

Details Communication system Communication system

1988-06-30

1989-09-12

Cangialosi, Salvatore

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 9, 380 20, H04L 902

Patent

active

048667722

ABSTRACT:
In a communication system such as the videotext system, the data are prepared according to the so-called ISO layer model before such data are transmitted via a conventional telephone circuit. The fact that telephone circuits may be tapped constitutes a danger in that unauthorized persons may gain access to data relating to individuals.
According to the invention, a selectively connectable coding and decoding module of the bypass-type is provided between the third layer and the active layer of the ISO layer model, said active layer being disposed on top of said third layer. Said module is effectively cut into or connected in the data preparation state at least while the actual message data are being transmitted. In this way, sensitive data can be coded before such data are transmitted via the telephone circuit.

REFERENCES:
patent: 4091423 (1978-05-01), Branscome
patent: 4177510 (1979-12-01), Appell et al.
patent: 4368357 (1983-01-01), Gurak
patent: 4386233 (1983-05-01), Smid et al.
patent: 4438824 (1984-03-01), Mueller Schloer
patent: 4496975 (1985-01-01), Noirel
patent: 4536791 (1985-08-01), Campbell et al.
patent: 4578530 (1986-03-01), Zeidler
patent: 4718060 (1988-01-01), Oguchi et al.

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