Efficient authentication with key update

Details Efficient authentication with key update Efficient authentication with key update

H - Electricity

04

L

H04L 9/32 (2006.01) H04Q 7/32 (2006.01) H04Q 7/38 (2006.01)

Patent

CA 2282942

A more efficient method for performing authentication is provided by using an authentication challenge transmitted to a terminal to provide the terminal with the information to calculate authentication and cipher key values. As a result, a separate communication is not required to provide the terminal with key values. A visiting authentication center obtains a random value R T, an authentication key value K A and a cipher key value K C from a home authentication center. The visiting authentication center then transmits the random number R T to the terminal to update the terminal's authentication key and cipher key values, and to challenge the terminal as part of an authentication process. The terminal uses R T to calculate the authentication key value K A and the cipher key value K C, and to respond to the visiting authentication center's challenge. In addition, the authentication key value is used to verify the visiting network's response to the terminal's authentication challenge to the network.

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