Security Analysis of Provably Secure Constant Round Dynamic Group Key Agreement

Joseph Chee Ming TEO  Chik How TAN  Jim Mee NG  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E89-A    No.11    pp.3348-3350
Publication Date: 2006/11/01
Online ISSN: 1745-1337
DOI: 10.1093/ietfec/e89-a.11.3348
Print ISSN: 0916-8508
Type of Manuscript: LETTER
Category: Information Security
dynamic group key agreement,  secure group communication,  authenticated group key agreement,  

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Recently, Dutta and Barua proposed provably secure constant round authenticated group key agreement protocols in dynamic scenario. In this letter, we show that their Leave Protocol does not provide forward secrecy, that is, a leaving user can still obtain the new session key used in subsequent sessions.