The Extensible Authentication Protocol (EAP) is an authentication framework that supports multiple authentication mechanisms [38] between a peer and an authentication server in a data communication network. EAP is used as a useful tool for enabling user authentication and distribution of session keys. There are numerous EAP methods that have been developed by global SDOs such as IETF, IEEE, ITU-T, and 3GPP. In this paper, we analyze the most widely deployed EAP methods ranging from the EAP-TLS

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... 27] to the EAP-PSK [25] . In addition, we derive the security requirements of EAP methods meet, evaluate the typical EAP methods in terms of the security requirements, and discuss the features of the existing widely-deployed EAP methods. In addition, we identify two typical use cases for the EAP methods. Finally, recent global standardization activities in this area are reviewed. key words: EAP, IKEv2, EAP-MD5, EAP-TLS, PEAP, TLS