| Electrical & Electronic Engineering |
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| Non-interactive identity-based threshold signature scheme without random oracles |
| Xun SUN, Jian-hua LI, Shu-tang YANG, Gong-liang CHEN |
| Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; School of Information Security Engineering, Shanghai Jiao Tong University, Shanghai 200240, China |
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Abstract A (t, n) threshold signature scheme distributes the secret key and hence the signing ability to n players in a way that any set of t+1 or more honest players can collaborate to sign, while any set of t players cannot. In this paper we propose an identity-based threshold signature (IBTHS) scheme from bilinear pairings. The signing phase of our scheme is non-interactive, meaning that the signing players do not need to talk to each other. We prove our scheme secure (i.e., unforgeable and robust) in the standard model (i.e., without random oracles). No earlier proposed IBTHS scheme achieved even one of the features of being non-interactive (in the signing phase) and secure in the standard model.
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Received: 15 October 2007
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