| 摘要 |
A method of authenticating a user to a network, the user being in possession of first and second authentication credentials associated respectively with first and second authentication procedures. The method comprises sending a challenge from the network to the user according to said second authentication procedure, receiving the challenge at the user and computing a response using said first credential or keying material obtained during an earlier running of said first authentication procedure, and said second credential, sending the response from the user to the network, and receiving the response within the network and using the response to authenticate the user according to said second authentication procedure.
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