Method of coding and decoding messages

Telegraphy – Systems – Printing

Patent

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Details

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.

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