Anonymity authentication method for global mobility networks

An anonymity authentication method for global mobility networks is provided. When a mobile user (MN) roams from an inner network to an outer network, a random number is introduced for participating an operation of the transmitted messages either in a registration procedure between the mobile user and a home agent (HA) or in a mutual verification procedure between the mobile user, the home agent, and a foreign agent (FA). Moreover, the operation of the transmitted messages uses only hash function and XOR operator. Therefore, the anonymity authentication method of the present disclosure has high efficiency, high security and low cost.