ISSN : 1796-2056
Volume : 4    Issue : 2    Date : April 2009

Efficient Solution to Password-based Key Exchange for Large Groups
Shuhua Wu and Yuefei Zhu
Page(s): 140-147
Full Text:
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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.

Index Terms
password authenticated; group key establishment; provably secure