System for transmitting information between an emitting...

H - Electricity – 04 – N

Patent

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350/24

H04N 7/16 (2006.01) H04N 7/167 (2006.01)

Patent

CA 1157144

ABSTRACT OF THE DISCLOSURE A system for transmitting information between an emitting center and receiving stations, comprising: a subscription administration center generating a plu- rality of subscriber's keys Ci 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 Mi obtained from said subscriber's keys Ci and from the operating key K by means of an algorithm, all the mes- mages Mi then being directed towards the emitting center; and automatic encryption means using the ope- rating 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 Ci; a circuit for restoring the operating key receiving the messages Mi and the subscriber's key Ci, this circuit working out an algorithm for restoring the signal corresponding to the operating key K used in the emitting center; an au- tomatic decryption means; and at least one charging station capable of temporarily receiving the subscrip- tion holders and permanently recording one of the sub- scribers's key Ci thereon.

344684

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