Overcome Weakness of a Password-Based Group Key Agreement Protocol
Dutta, R.
Computers and Communications, 2007. ISCC 2007. 12th IEEE Symposium on
Volume , Issue , 1-4 July 2007 Page(s):469 - 474
Digital Object Identifier   10.1109/ISCC.2007.4381473
Summary:Recently, Kim et al. proposed a very efficient provably secure group key agreement protocol KLL, security of which relies on the computational Diffie-Hellman (CDH) assumption in the presence of random oracles. In our earlier work, we embed the protocol KLL into password-based environment -yielding the protocol DB-PWD. In this paper, we detect certain flaws in the protocol DB-PWD and take suitable measures to overcome these attacks. We introduce a protocol MDB-PWD -an improved variant of the protocol DB-PWD and analyze its security in the security framework formalized by Bellare et al. in both the ideal cipher model and the random oracle model under CDH assumption.

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