Encrypted data transmission system employing means for randomly

Details Encrypted data transmission system employing means for randomly Encrypted data transmission system employing means for randomly

1992-04-23

1995-05-02

Gregory, Bernarr E.

Cryptography

Key management

Having particular key generator

380 9, 380 21, 380 29, 380 49, H04L 900

Patent

active

054127300

ABSTRACT:
A modem suitable for transmitting encrypted data over voice-grade telephone line. The modem is implemented by the combination of integrated circuit components including a microprocessor, a serial communications controller which communicates with connected data terminal equipment, and a modulator/demodulator for translating between voice band tone signals and digital data. Pseudo random number generators are employed at both the transmitting and receiving stations to supply identical sequences of encryption keys to a transmitting encoder and a receiving decoder. An initial random number seed value is made available to both stations. The random number generators are advanced at times determined by predetermined characteristics of the data being transmitted so that, after transmission has taken place, the common encryption key can be known only to the transmitting and receiving stations.

REFERENCES:
patent: 4809327 (1989-02-01), Shima
patent: 4876716 (1989-10-01), Okamoto
patent: 4985919 (1991-01-01), Naruse et al.

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