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In this paper, we propose an efficient multiparty signature scheme for wireless networks where a given number of signees can jointly sign a document, and it can be verified by any entity who possesses the certified group public key. Our scheme is based on an efficient threshold key generation scheme which is able to defend against both static and adaptive adversaries. Specifically, our key generation method employs the bit commitment technique to achieve efficiency in key generation and share refreshing; our share refreshing method provides proactive protection to long-lasting secret and allows a new signee to join a signing group. We demonstrate that previous known approaches are not efficient in wireless networks, and the proposed multi-party signature scheme is flexible, efficient, and achieves strong security for low-power devices in wireless networks.
Date of Publication: Feb. 2009