Efficient Hybrid Password-Based Authenticated Group Key Exchange
DOI: 10.1007/978-3-642-00672-2_52 Conference: Advances in Data and Web Management, Joint International Conferences, APWeb/WAIM 2009, Suzhou, China, April 2-4, 2009, Proceedings
This paper presents an efficient solution to the group key exchange problem in the password-based scenario. Our scheme can
combine existing group protocols to get a hybrid group key exchange protocol which is efficient in terms of both computation
and communication when the number of group users is very large. Our solution allows users to securely join and leave the group
at any time—the so-called dynamic case. Moreover, we prove its security in the random oracle model.
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ABSTRACT: This paper presents an efficient solution to key exchange problem for large groups in the password- based scenario. Our scheme can combine existing group protocols to get a hybrid group key exchange protocol which is efficient in terms of both computation and communication. And the resulting protocol allows users to securely join and leave the group at any time—the so-called dynamic case. For dynamic group communications, we propose an efficient key-updating algorithms so that the group key is only known to the members of the newly formed pool. Furthermore, our proposal does not introduce new idealizing assumptions or high entropy secrets for authentication.
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