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Published in:
2008 | OriginalPaper | Chapter
Threshold RSA for Dynamic and Ad-Hoc Groups
Authors : Rosario Gennaro, Shai Halevi, Hugo Krawczyk, Tal Rabin
Published in: Advances in Cryptology – EUROCRYPT 2008
Publisher: Springer Berlin Heidelberg
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We consider the use of threshold signatures in ad-hoc and dynamic groups such as MANETs (“mobile ad-hoc networks”). While the known threshold RSA signature schemes have several properties that make them good candidates for deployment in these scenarios, none of these schemes seems practical enough for realistic use in these highly-constrained environments. In particular, this is the case of the most efficient of these threshold RSA schemes, namely, the one due to Shoup. Our contribution is in presenting variants of Shoup’s protocol that overcome the limitations that make the original protocol unsuitable for dynamic groups. The resultant schemes provide the efficiency and flexibility needed in ad-hoc groups, and add the capability of incorporating new members (share-holders) to the group of potential signers without relying on central authorities. Namely, any threshold of existing members can cooperate to add a new member. The schemes are efficient, fully non-interactive and do not assume broadcast.