Encryption apparatus

Details Encryption apparatus Encryption apparatus

1989-07-05

1990-08-28

Buczinski, Stephen C.

Cryptography

Electric signal modification

Having production of printed copy

380 9, 380 28, 380 33, 380 35, H04L 906

Patent

active

049532111

ABSTRACT:
Encryption apparatus mainly intended for encrypting speech signals samples a signal to be encrypted at two differing rates, and reads the sampled signal into storage means at one of said rates and reads it out of said storage at the other of said rates so that the signal is alternately dispersed upwardly and downwardly with each pair of upward and downward dispersion representing a frame. To improve security the apparatus further generates a pseudo random binary number, defines a superframe structure consisting of a predetermined number of said frames, and sets the starting point of each individual superframe as an upward or a downward dispersion in dependence on the next digit of said pseudo-random binary number.

REFERENCES:
patent: 4099027 (1978-07-01), Whitten
patent: 4742546 (1988-05-01), Nishimura

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