Patent ID: 7203836

Claim:
A method for mutual authentication of a terminal and a network comprising the steps of: receiving, at the network, a triplet data set from an authentication center, the triplet data set including a first random number (challenge 1 ), a first response (response 1 ) and a second response (response 2 ); sending the first random number (challenge 1 ) to the terminal; receiving, from the terminal, a first calculated response, calculated by the terminal based on the first random number (challenge 1 ), wherein the first calculated response is used as a second challenge (challenge 2 ); authenticating the terminal by matching the first calculated response with the first response (response 1 ); sending the second response (response 2 ) to the terminal; and wherein the network is authenticated by the terminal by matching a second calculated response, calculated by the terminal based on the first random number (challenge 1 ) with the second response (response 2 ).