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(51) Int. Cl. network together with a replay attack protector. The packet G06F 7/04(2006.01) data network obtains authentication triplets, forms a session H04L 9/00(2006.01) key using them, and sends back to the mobile node chal H04M I/66(2006.01) lenges and a cryptographic authenticator made by using the H04M I/68(2006.01) session key. The mobile node can then form the rest of the H04M, 3/6(2006.01) authentication triplets using the challenges and then form the HO4K I/OO(2006.01) session key. With the session key, the mobile node can check (52) US Cl. 726/29: 713/168: 455/411 the validity of the cryptographic authenticator. If the authen (58) Field of Classification search s 713f153 ticator is correct, the mobile node sends a cryptographic 713/168; 709/223, 225, 229, 238; 380/270, 380/273; 455/432.1, 410, 411, 415, 428, 455/433; 726/29 See application file for complete search history.