Attack on the Sun-Chen-Hwang's Three-Party Key Agreement Protocols Using Passwords

Junghyun NAM  Seungjoo KIM  Dongho WON  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E89-A   No.1   pp.209-212
Publication Date: 2006/01/01
Online ISSN: 1745-1337
DOI: 10.1093/ietfec/e89-a.1.209
Print ISSN: 0916-8508
Type of Manuscript: Special Section LETTER (Special Section on Cryptography and Information Security)
Category: Protocol
three-party key agreement,  password,  verifier,  

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We show that Sun-Chen-Hwang's three-party key agreement protocols using passwords are insecure against an active adversary. Further, we recommend a small change to the protocols that fixes the security problem.