Key management for encrypted packet based networks

Details Key management for encrypted packet based networks Key management for encrypted packet based networks

1990-10-16

1991-09-10

Tarcza, Thomas H.

Cryptography

Communication system using cryptography

Data stream/substitution enciphering

380 44, 34082507, 36424295, H04L 900

Patent

active

050480871

ABSTRACT:
In a packet based communication network 10, a key management center 20 is used to distribute cryptographic keys for either a switched virtual circuit or a permanent virtual circuit. The disclosed methods allow the key management center 20 to communicate directly with the data encryption/decryption devices (DE's) 14 even though they operate in a transparent mode (rather than a store and forward mode). This is accomplished by balancing link counters with calls to fictitious addresses and/or use of interrupt packets transferred between the DTE 12 and the DE 14. In permanent virtual circuits, the MAC of the last packet transmitted under the old cryptographic key is exchanged to synchronize the key change.

REFERENCES:
patent: 4182933 (1980-01-01), Rosenblum
patent: 4578531 (1986-03-01), Everhart et al.
patent: 4607137 (1986-08-01), Jansen et al.
patent: 4965804 (1990-10-01), Trbovich et al.
The Cipher X 5000 Product Brochure and Technical Reference Manual.
The Dynapack Product Brochure.

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