Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1980-01-23
1982-04-06
Birmiel, Howard A.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358 86, 358141, 178 2208, 178 2209, 455 2, H04L 900
Patent
active
043239218
ABSTRACT:
A system for transmitting information between an emitting center and receiving stations, comprising: a subscription administration center generating a plurality of subscriber's keys C.sub.i changing randomly at relatively long intervals of the order of a month; in the emitting center: a generator of an operating key K changing randomly at relatively short intervals of the order of a few minutes; a circuit for forming messages M.sub.i obtained from said subscriber's keys C.sub.i and from the operating key K by means of an algorithm, all the messages M.sub.i then being directed towards the emitting center; and automatic encryption means using the operating key K, in each receiving station: a subscription holder on which is recorded a signal corresponding to at least one of the subscriber's keys C.sub.i ; a circuit for restoring the operating key receiving the messages M.sub.i and the subscriber's key C.sub.i, this circuit working out an algorithm for restoring the signal corresponding to the operating key K used in the emitting center; an automatic decryption means; and at least one charging station capable of temporarily receiving the subscription holders and permanently recording one of the subscriber's key C.sub.i thereon.
REFERENCES:
patent: 3934079 (1976-01-01), Barnhart
patent: 3956615 (1976-05-01), Anderson et al.
patent: 3997718 (1976-12-01), Ricketts
patent: 4081832 (1978-03-01), Sherman
patent: 4214230 (1980-07-01), Fak et al.
Birmiel Howard A.
Etablissement Public de Diffusion dit "Telediffusion de France"
L'Etat Francais, represente par le Secretaire d'Etat aux Poste e
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