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Published in:
2006 | OriginalPaper | Chapter
A Non-malleable Group Key Exchange Protocol Robust Against Active Insiders
Authors : Yvo Desmedt, Josef Pieprzyk, Ron Steinfeld, Huaxiong Wang
Published in: Information Security
Publisher: Springer Berlin Heidelberg
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In this paper we make progress towards solving an open problem posed by Katz and Yung at CRYPTO 2003. We propose the first protocol for key exchange among
n
≥2
k
+1 parties which simultaneously achieves all of the following properties:
1. Key Privacy (including forward security) against active attacks by group
outsiders
,
2. Non-malleability — meaning in particular that no subset of up to
k
corrupted group
insiders
can ‘fix’ the agreed key to a desired value, and
3. Robustness against denial of service attacks by up to
k
corrupted group
insiders
.
Our insider security properties above are achieved assuming the availability of a reliable broadcast channel.