A SECURE AND EFFICIENT ECC-BASED AKA PROTOCOL FOR WIRELESS MOBILE COMMUNICATIONS

Considering the performance, encrypting the transmission message by the symmetric cryptosystem is the best choice if the session key generation problem is overcome. Diffie-Hellman key exchange protocol gives a new direction for making session key but is lack of the authentication property. The RSA-based public key cryptography makes the sufficient security for the key agreement but is not suitable for wireless mobile systems. In 2005, Sui et al. proposed an authenticated key agreement (AKA) protocol based on the elliptic curve cryptography (ECC) for wireless mobile communication. Lu et al. pointed out a secure defect in Sui et al.’s protocol and proposed an enhanced protocol. Later, Chang et al. stated that Lu’s scheme is insecure and proposed an improved scheme in 2008. We found that Chang et al.’s scheme did not satisfy the mutual authentication, so a securer and more efficient protocol is proposed. The protocol can be applied not only in 3GPP2 specification but also in other wireless environments.

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