METHOD AND APPARATUS FOR FORMING SECRET CODES

摘要

INVENTORS: HANS BALDINGER and PETER HARTMANN INVENTION: METHOD AND APPARATUS FOR FORMING SECRET CODES During the secret data transmission the problem exists of transmission of keys between the subscribers without utilizing the same enciphered transmission system. To generate a new key from the momentarily existing key by means of the existing ciphering equipment, however while incorporating at least one additional element, there is employed the point in time when the new key is produced together with the existing key. This time point can be agreed upon between the subscribers ahead of time or by means of an enciphered tranmission path. At each station of a key signal generator there is removed a pseudo-random signal and infed by means of a gate to a key storage or memory. The gate is released or rendered conductive, starting from an externally determined point in time, for a number of bits which at least correspond to the capacity of the key storage.