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The 3rd Generation Partnership Project (3GPP) standard is developing System Architecture Evolution (SAE)/Long Term Evolution (LTE) architecture for the next generation mobile communication system. To provide secure 3G-WLAN inter-working in the SAE/LTE architecture, Extensible Authentication Protocol-Authentication and Key Agreement (EAP-AKA) is used. EAP-AKA protocol has several vulnerabilities such as disclosure of user identity, man-in-the-middle attack, SeQuence Number (SQN) synchronization, and additional bandwidth consumption. The analyzes threats and attacks in 3G and proposes a new authentication and key agreement protocol based on EAP-AKA. The proposed protocol combines Elliptic Curve Diffie-Hellman (ECDH) with symmetric key cryptosystem to overcome the vulnerabilities present in the EAP-AKA protocol.
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