Secure communication system having long-term keying variable

Details Secure communication system having long-term keying variable Secure communication system having long-term keying variable

1981-09-28

1995-06-27

Cangialosi, Salvatore

Cryptography

Key management

Having particular key generator

380 44, H04L 926

Patent

active

054286867

ABSTRACT:
A secure communication apparatus incorporates a longterm, non-extractable master key variable which is held in common by all terminals. A pseudorandom bit sequence generator within the transmitter provides a binary bit stream which is transmitted unencrypted to the intended receiver. Both terminals simultaneously mix the master variable with the transmitted pseudorandom bit stream in an identical manner to create a common separate working variable which is subsequently used for data encryption and decryption.

REFERENCES:
patent: 3439279 (1969-04-01), Guanella
patent: 3781472 (1973-12-01), Goode et al.
patent: 3781473 (1973-12-01), Goode et al.
patent: 4052565 (1977-10-01), Baxter et al.
patent: 4200770 (1980-04-01), Hellman et al.
patent: 4316055 (1982-02-01), Feistel

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