H - Electricity – 04 – L
Patent
H - Electricity
04
L
340/70
H04L 9/00 (2006.01)
Patent
CA 1161513
ABSTRACT OF THE DISCLOSURE : The system enciphers a digital signal of n-bit words Ni into an enciphered signal of n-bit words Ri. In the enciphering unit, a logic circuit delivers each enciphered word Ri through a logic operation g performed on the word Ni and on an n-bit memorized word Pi-1. An addressing circuit formulates an address word Ai-1 having a bit fully or partly belonging at least to the preceding enciphered word Ri-1. A memory of 2a predetermined Pi-1 words is read by each address word Ai-1 in order to transmit a corresponding word Pi 1 to the logic circuit for it to perform the g operation such that Ri = g(Ni, Pi-1) The deciphering unit receives the enciphered words Ri for formulating the address words Ai controlling the reading of the corresponding words Pi out of 2a memorized. Each deci- phered word Ni is obtained by a logic operation h, referred to as contrary to g, performed on the enciphered word Ri and on the memorized word Pi-1, such that Ni = h(Ri, Pi-1) The memories can be programmed by computers which, as per a predetermined algorithm,compute a table of words Pi for a given key.
363826
Bernede Georges
Gregeois Jean
Robic Robic & Associes/associates
Telediffusion de France
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