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Journal of Communications

Consistency of group key exchange protocols

Yuanbo Guo

Published Jan 1, 2008• 0 citations
OpenAlex

Abstract

The consistency is a basic security requirement,but it is much trickier and many times overlooked. By care-fully analyzed to several famous were found provably-secure group key exchange protocols at present,different attacks of the consistency to these protocols were found respectively. These attacks will result in that all the members have different view of peers’ identities and destroying the integrity of the current group. Furthermore,improvements to overcome the security vulnerabilities of these protocols were proposed.

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The consistency is a basic security requirement,but it is much trickier and many times overlooked. By care-fully analyzed to several famous were found provably-secure group key exchange protocols at present,different attacks of the consistency to these protocols were found respectively. These attacks will result in that all the members have different view of peers’ identities and destroying the integrity of the current group. Furthermore,improvements to overcome the security vulnerabilities of these protocols were proposed.
Group key exchange protocols allow their participants to compute a secret key which can be used to ensure security and privacy for various multi- party applications. The resulting group key should be computed through coop- eration of all protocol participants such that none of them is trusted to have any advantage concerning the protocol's output. This trust relationship states the main difference between group key exchange and group key transport protocols. Obvi- ously, misbehaving participants in group key exchange protocols may try to influ- ence the resulting group key, thereby disrupting this trust relationship, and also causing further security threats. This paper analyzes the currently known secu- rity models for group key exchange protocols with respect to this kind of attacks by malicious participants and proposes an extended model to remove the identi- fied limitations. Additionally, it proposes an efficient and provably secure generic solution, a compiler, to guarantee these additional security goals for group keys exchanged in the presence of malicious participants.
Group key management is one of the basic building blocks in securing group communication.A number of solutions to group key exchange have been proposed,but most of them are not scalable and,in particular,require at least 0(log n) communication rounds.We formally present a constant -round Identity-based protocol with forward secrecy for group key exchange,which is provably secure in the security model introduced by Bresson et al.Our protocol focuses on round efficiency and the number of communication round is only one greater than the lower bound presented by Becker and Wille.And,the protocol provides a batch verification technique,which simultaneously verifies the validity of messages from other group participants and greatly improves computational efficiency.Moreover,in our protocol,it is no necessary of always-online key generation center during the execution of the protocol compared to other Identity-based protocols.
Group key exchange protocols are basic protocols to provide privacy and integrity in secure group communication. This paper discusses the security of one type of group key exchange protocols and defines the kind of protocols as broadcaster group protocols. It points out two attacks on this kind of protocols. The first attack can be avoided by using fresh values in each action during one session of the group protocol. The second attack should be related with concrete application. It also proposes a dynamic key agreement protocol as an example of solutions at the last part of the paper.
Abstract: Group key management is one of the basic building blocks in securing group communication. A number of solutions to group key exchange have been proposed, but most of them are not scalable and require a number of rounds linear in the number of group members. We formally present a constant-round Identity-based protocol with forward secrecy for group key exchange, which is provably secure in the security model introduced by Bresson et al. Our protocol focuses on round efficiency and the number of communication round is only two. And, the protocol provides a batch verification technique, which simultaneously verifies the validity of messages from other group participants and greatly improves computational efficiency. Moreover, in our protocol, it is no necessary of always-online key generation center during the execution of the protocol compared to other Identity-based protocols. Key-Words:- provable security, identity-based, group key exchange, constant round, secret-share. 1
Group key exchange protocols play main role in group applications such as computer networks, telecommunication and military systems. Given the wide range of usage of group applications, research and design of these protocols can play an important role in securing international exchanges, trade and military issues. Most existing group key exchange protocols establish multi-party or group key exchange protocols based on extending the two party well known Diffie- Hellman key exchanges. The security of these protocols is based on this assumption that difficulty of solving group Dif- fie-Hellman problem can be reduced to the difficulty of two party Diffie-Hellman problems. In spite of this assumption, Group key exchanges are not simply extension of two party protocols. In fact there are many differences and challenges that must be considered in design and implementation of these protocols. This difference is due to essential difference between peer to peer communication and group communication. In group communication in addition to considering the main goal e.g. obtaining group session key, consideration of group member changing is important too. In this paper, a Dynamic ID-based Group Key Agreement protocol based on Weil pairing is proposed. This complete ternary tree struc- ture is used and dynamic changes in group are considered too. Finally we show that the proposed protocol is more effi- cient than other protocols with similar structure and also satisfies all known security requirements .