Cryptography – Key management – Having particular key generator
Patent
1987-02-25
1989-09-26
Tarcza, Thomas H.
Cryptography
Key management
Having particular key generator
380 7, 380 10, 380 19, 380 20, 358133, 358135, 381 31, 375 30, 375122, 455 72, H04L 902, H04N 7167, H04B 166
Patent
active
048706825
ABSTRACT:
A signal scrambling system is provided in which the scrambler includes a transition limiter which limits the size of changes in the amplitude of the input clear signal, a device for generating a pseudo random signal and combining the pseudo random and clear signals, and a transposer for reducing the bandwidth of the channel needed for the scrambled signal. The descrambler includes another pseudo random signal generator and device for combining the random signal with the received scrambled signal, as well as another transposer, for recovering a descrambled signal. The system minimizes the power bandwidth of the channel necessary to transmit accurately the scrambled signal which contains no vestiges, not even an average intensity, of the original input signal.
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Hansen Henry L.
Morrey Walter T.
Household Data Services (HDS)
Tarcza Thomas H.
Wallace Linda J.
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