Telegraphy – Systems – Printing
Patent
1981-01-26
1984-08-14
Cangialosi, Sal
Telegraphy
Systems
Printing
178 2217, 178 2219, 178 2213, H04L 900
Patent
active
044651538
ABSTRACT:
Method of coding and decoding messages wherein a basic key and a random message key, which is transmitted prior to the message, are used. Using a plurality of basic keys entails the problem that the proper basic key must be set in the receiving station. In accordance with the present method, the sequence of a portion (II) of the message key and of a number of check characters derived therefrom are coded, prior to the actual message transmission, using the basic key and a different portion (I) of the message key. Decoding in the receiving station is done by using a basic key which is chosen from a group of basic keys, and the different portion (I) of the message key. A test circuit 21 examines whether the decoded check characters correspond to the check characters derived in the receiving station from the decoded portion (II) of the message key. A positive test result indicates that the desired basic key has been found.
REFERENCES:
patent: 3291908 (1966-12-01), Ehrat
patent: 3752920 (1973-08-01), Gemperle
patent: 4211891 (1980-07-01), Glitz
patent: 4227253 (1980-10-01), Ehrsam et al.
van de Pas Andries J. M.
van den Ende Antonius C. J.
Abate Joseph P.
Cangialosi Sal
Goodman Edward W.
Kaiser K. R.
U.S. Philips Corporation
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