Telegraphy – Systems – Printing
Patent
1986-01-21
1987-01-20
Cangialosi, Salvatore
Telegraphy
Systems
Printing
178 2215, 178 2216, H04L 902
Patent
active
046381201
ABSTRACT:
In a system for the transmission of confidential data between a transmitter 1) and a receiver (3), the transmitter (1) transmits a standard key E to the receiver (3). The standard key E preferably is a random number generated within the transmitter (1). An element at the location of the transmitter (1) calculates an intrinsic key R.sub.1 for coding the data to be transmitted, and an element at the location of the receiver calculates an intrinsic key R.sub.2 for decoding the data. The calculation of each of the intrinsic keys R.sub.1 and R.sub.2 is accomplished in each case by a microprocessor (4' and 5') situated within a portable object (4 and 5) which also includes a memory (4" and 5") storing a program, a secret code S, and an identification code I.sub.n. The intrinsic keys R.sub.1 and R.sub.2 are each calculated as a function of the secret code S, the identification code I.sub.n, and the standard key E. The portable objects at the transmitter and receiver ends of the system must be matched.
REFERENCES:
patent: 3291908 (1966-12-01), Ehrat
patent: 3781473 (1973-12-01), Goode et al.
patent: 4200770 (1980-04-01), Hellman et al.
patent: 4206315 (1980-06-01), Matyas et al.
patent: 4211919 (1980-07-01), Ugon
patent: 4264782 (1981-04-01), Konheim
patent: 4309569 (1982-01-01), Merkle
patent: 4369332 (1983-01-01), Campbell, Jr.
Cangialosi Salvatore
Compagnie Internationale pour l'Informatique Cii Honeywell Bull
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