Cryptology ePrint Archive: Report 2004/250

Identity Based Threshold Proxy Signature

Jing Xu and Zhenfeng Zhang and Dengguo Feng

Abstract: Identity-based (ID-based) public key cryptosystem can be a good alternative for certificate-based public key setting, especially when efficient key management and moderate security are required. In a $(t,n)$ threshold proxy signature scheme, the original signer delegates the power of signing messages to a designated proxy group of $n$ members. Any $t$ or more proxy signers of the group can cooperatively issue a proxy signature on behalf of the original signer, but $t-1$ or less proxy signers cannot. In this paper, we present an ID-based threshold proxy signature scheme using bilinear pairings. We show the scheme satisfies all security requirements in the random oracle model. To the best of authors' knowledge, our scheme is the first ID-based threshold proxy signature scheme.

Category / Keywords: public-key cryptography / ID-based signatures, threshold proxy signatures, bilinear pairings.

Date: received 23 Sep 2004

Contact author: xujing at is iscas ac cn

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Version: 20040927:195948 (All versions of this report)

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