The third generation partnership project (3GPP) has addressed the feasibilityof interworking and specified the interworking architecture and securityarchitecture for third generation (3G)-wireless local area network (WLAN), itis developing, system architecture evolution (SAE)/ long term evolution (LTE)architecture, for the next generation mobile communication system. To provide asecure 3G-WLAN interworking in the SAE/LTE architecture, Extensibleauthentication protocol-authentication and key agreement (EAP-AKA) is used.However, EAP-AKA have several vulnerabilities. Therefore, this paper not onlyanalyses the threats and attacks in 3G-WLAN interworking but also proposes anew authentication and key agreement protocol based on EAP-AKA. The proposedprotocol combines elliptic curve Diffie-Hellman (ECDH) with symmetric keycryptosystem to overcome the vulnerabilities. The proposed protocol is used inhybrid coupled 3G-WLAN convergence network to analyse its efficiency in termsof QoS metrics, the results obtained using OPNET 14.5 shows that the proposedprotocol outperforms existing interworking protocols both in security and QoS.
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