06795555 is referenced by 11 patents and cites 1 patents.

The calculation of encryption keys is a processor intensive undertaking that is not suited for “thin client” terminal devices typically used for session applications in an Internet Protocol network. The present invention provides an encryption scheme for use with such terminal devices for the secure transmission of session data that minimizes session set-up delays associated with the exchange of encryption keys. First, keys are negotiated between network elements using prior art techniques (e.g. shared secret, IKE, Diffie-Hellman, RSA). Then, security is maintained by refreshing symmetric keys after each session under cover of an existing key. Perfect Forward Security (PFS) can be provided by “breaking the chain” through periodic key refreshes during system idle times.

Title
Encryption key exchange protocol
Application Number
9/475044
Publication Number
6795555 (B1)
Application Date
December 30, 1999
Publication Date
September 21, 2004
Inventor
Michael C G Lee
Ottawa
US
Brian R Parisien
Dunrobin
US
Assignee
Nortel Networks
US
IPC
H04L 9/00
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