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
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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