Automatic selection of decryption key for multiple-key encryptio

Details Automatic selection of decryption key for multiple-key encryptio Automatic selection of decryption key for multiple-key encryptio

1981-06-17

1984-04-03

Cangialosi, Sal

Telegraphy

Systems

Printing

178 2213, 455 26, H04K 100

Patent

active

044409761

ABSTRACT:
A receiver of digitally encoded voice signals that may be encrypted according to a plurality of keep subjects a received signal to decryption according to each of the keys. Decrypted signals are tested for the presence of modulation, and the signal, if any, that is decrypted is recovered for use. If it is desired, a visual indication may tell a user which key is being used to decrypt the signal.

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patent: 4182933 (1980-01-01), Rosenblum
patent: 4197502 (1980-04-01), Sumner et al.
patent: 4223182 (1980-09-01), Fraser
Science, vol. 197c7(77), pp. 438-440.

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