Encryption system key distribution method and apparatus

Details Encryption system key distribution method and apparatus Encryption system key distribution method and apparatus

1982-06-09

1986-03-25

Cangialosi, Salvatore

Telegraphy

Systems

Printing

178 2211, H04K 102

Patent

active

045785317

ABSTRACT:
Encryption systems typically rely on the distribution of cipher keys between terminals for scrambling and unscrambling transmitted messages. Elaborate security precautions are necessary to protect the cipher keys since a compromise of the key could result in a compromise of the transmission. There is disclosed a key distribution method and apparatus which uses a channel from identified terminals to a central key distribution center for the establishment, on a one-session basis, of the key which is to be used for the next session between those terminals. The key establishing link is itself encoded using a cipher key which changes after each usage. Provision is made to verify, for each new connection, that a compromise has not priorly occurred.

REFERENCES:
patent: 4182933 (1980-01-01), Rosenblum
patent: 4200770 (1980-04-01), Hellman et al.
patent: 4203166 (1980-05-01), Ehrsam et al.
patent: 4218738 (1980-08-01), Matyas et al.
patent: 4238853 (1980-12-01), Ehrsam et al.
patent: 4386233 (1983-05-01), Smid et al.
patent: 4417338 (1983-11-01), Darida
patent: 4418275 (1983-11-01), Oosterbaan et al.

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