Security Analysis of Provably Secure Constant Round Dynamic Group Key Agreement
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
Constant round dynamic group key agreement
ISC'05 Proceedings of the 8th international conference on Information Security
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In a secure group communication, a group key agreement is to provide a secret key exchange among a group of users. When a new user joins the group, a new group key will be established. In this paper, we analyse Horng's joint protocol and show that this protocol does not provide backward secrecy. This means that a new joining user is able to discover the previous group key used by the previous group member.