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On the Security of a Simple Three-Party Key Exchange Protocol without Server's Public Keys
Nam, Junghyun,Choo, Kim-Kwang Raymond,Park, Minkyu,Paik, Juryon,Won, Dongho Hindawi Publishing Corporation 2014 The Scientific World Journal Vol.2014 No.-
<P>Authenticated key exchange protocols are of fundamental importance in securing communications and are now extensively deployed for use in various real-world network applications. In this work, we reveal major previously unpublished security vulnerabilities in the password-based authenticated three-party key exchange protocol according to Lee and Hwang (2010): (1) the Lee-Hwang protocol is susceptible to a man-in-the-middle attack and thus fails to achieve implicit key authentication; (2) the protocol cannot protect clients' passwords against an offline dictionary attack; and (3) the indistinguishability-based security of the protocol can be easily broken even in the presence of a passive adversary. We also propose an improved password-based authenticated three-party key exchange protocol that addresses the security vulnerabilities identified in the Lee-Hwang protocol.</P>