Method for key management of point-to-point communications

Details Method for key management of point-to-point communications Method for key management of point-to-point communications

1993-09-27

1995-04-25

Cain, David C.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 28, 380 49, H04L 900

Patent

active

054106028

ABSTRACT:
A method of secure key distribution in a communication system having a plurality of subscriber units and an infrastructure communication center is provided. A first subscriber unit sends a request to the infrastructure communication center for a secure communication link with a second subscriber unit. This request includes an encrypted session encryption key which was encrypted with a first subscriber registration key. The infrastructure communication center decrypts the encrypted session encryption key with the first subscriber registration key. Subsequently, the infrastructure communication center re-encrypts the session encryption key with a second subscriber registration key. This re-encrypted session encryption key is sent to the second subscriber unit. In an alternative method, the first subscriber unit and the infrastructure communication center a priori know a session key. Therefore, the infrastructure communication center only needs to encrypt and send the session encryption key to the second subscriber unit, in response to a request by the first subscriber unit.

REFERENCES:
patent: 5124117 (1992-06-01), Tatebayashi et al.
patent: 5239294 (1993-08-01), Flanders et al.
patent: 5301247 (1994-04-01), Rasmussen et al.

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