一个有效的代理环签名方案

摘要: 针对现有的代理环签名方案计算效率低的问题，基于Chow最近提出的基于身份的环签名，提出了一个有效的代理环签名方案。提出的方案能够防止原始签名人生成一个有效的代理环签名，从而保护了代理签名人的权益。在随机预言机模型下利用环签名分叉引理证明了所提方案的强不可伪造性依赖于CDH问题。在提出的方案中，代理环签名的计算不需要配对运算，签名验证只需要两个配对运算，与现有的方案相比，提出的方案具有更高的计算效率。

An Efficient Proxy Ring Signature Scheme

An efficient proxy ring signature scheme was proposed. The original signer firstly signs a warrant and then the proxy signers in the ring generate their proxy private keys and finally, each proxy signer can finally generate a proxy ring signature using the modified identity based ring signature proposed by Chow. Strong unforgeability of the new scheme was proven to rely on CDH problem by using forking lemma for ring signature under the random oracle model. No pairing operation is required for the generation of a proxy ring signature and only two pairing operations are required for the verification. Comparing with the existing schemes, the new scheme is more efficient in computation.