Common control audio decryptor

Details Common control audio decryptor Common control audio decryptor

1983-10-25

1986-05-27

Cangialosi, Salvatore

Telegraphy

Systems

Printing

178 2207, 178 2209, H04L 900

Patent

active

045916608

ABSTRACT:
Decryption of a plurality of simultaneously received, randomly phased signals is realized by employing a single data encryption standard module in a time shared manner. A plurality of process state counters, each of which is associated with a received signal, are employed to direct operations of the decryptor on a time shared basis. These operations include the generation on a time shared basis of so-called plain text data for each received signal, generation of corresponding encryption requests, and generation of cipher text data for each received signal which is used to decrypt associated received signal samples.

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Bernard A. Wright, "The Design of Picturephone.RTM. Meeting Service (PMS) Conference Centers for Video Teleconferencing", IEEE Communications Magazine, pp. 30-36, Mar. 1983.
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"Data Encryption Standard" FIPS-PUB-46, Jan. 15, 1977.

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