NDLI: Robust group key agreement using short broadcasts

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Robust group key agreement using short broadcasts

Content Provider	ACM Digital Library
Author	Kim, Jihye Jarecki, Stanisław Tsudik, Gene
Abstract	A group key agreement protocol (GKA) allows a set of players to establish a shared secret key which can be used to secure a subsequent communication. Several efficient constant-round GKA's have been proposed. However, their performance degrades if some players fail during protocol execution. This is a problem in practice, e.g. for mobile nodes communicating over wireless media, which can loose connectivity during the protocol execution. Current constant-round GKA protocols are either efficient and non-robust or robust but not efficient: Assuming a reliable broadcast communication medium, the standard encryption-based group key agreement protocol can be robust against arbitrary number of node faults, but the size of the messages broadcast by every player is proportional to the number of players. In contrast, non-robust group key agreement can be achieved with each player broadcasting just constant-sized messages. We propose a novel 2-round group key agreement protocol which tolerates up to T node failures using O(T)-sized messages, for any T. To exemplify the usefulness of this flexible trade-off between message size and fault tolerance, we show that the new protocol implies a fully-robust group key agreement with O(log n)-sized messages and expected round complexity close to 2, assuming random node faults. The proposed protocol is secure under the (standard) Decisional Square Diffie-Hellman assumption.
Starting Page	411
Ending Page	420
Page Count	10
File Format	PDF
ISBN	9781595937032
DOI	10.1145/1315245.1315296
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2007-10-28
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Fault tolerance Group key agreement
Content Type	Text
Resource Type	Article

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