Duplex analog scrambler

Details Duplex analog scrambler Duplex analog scrambler

1987-06-19

1989-05-02

Cangialosi, Salvatore

Cryptography

Communication system using cryptography

Frequency shift or inversion

380 47, 380 48, H04K 104, H04L 904

Patent

active

048275077

ABSTRACT:
An analog frequency inversion scrambler employing an exchange of random number seeds between an originating scrambler and an answering scrambler to create two pseudo-random frequency hopping rolling codes has been disclosed. The rolling code used in one direction of a duplex channel is different than the rolling code in the opposite direction and each code is synchronized by periodic synchronization signals.

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Hellman, "The Mathematics of Public-Key Cryptography", Scientific American, vol. 241, No. 2, Aug., 1979, pp. 146-157.
Lee et al., "A New Frequency Domain Speech Scrambling System Which Does Not Require Frame Synchronization"; IEEE Transactions on Communications, vol. COM-32, No. 4, Apr., 1984, pp. 444-456.
Frequency-Inverter IC Scrambles, Descrambles Voiceband Communications, EDN, Jun. 12, 1986, p. 87.
Van Lannep et al., "Frequency Inversion Scrambler Uses Micro-Processed SSB Audio", Mobile Radio Technology, Aug., 1984, pp. 34-40.
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Toyocom--Product Brochures--"Voice Encryptor TCV-851" and Voice Encryptor TCV-852 Series.

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