[Resource Topic] 2013/540: On the security of a password-only authenticated three-party key exchange protocol

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Title:
On the security of a password-only authenticated three-party key exchange protocol

Authors: Junghyun Nam, Kim-Kwang Raymond Choo, Juryon Paik, Dongho Won

Abstract:

This note reports major previously unpublished security vulnerabilities in the password-only authenticated three-party key exchange protocol due to Lee and Hwang (Information Sciences, 180, 1702-1714, 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.

ePrint: https://eprint.iacr.org/2013/540

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