具有不同代理群的多代理多签名方案

Provably Secure Multi-proxy Multi-signature Scheme with Different Proxy Groups

目前在大多数多代理多签名(multi-proxy multi-signature,MPMS)方案中,所有的原始签名人指定同一个代理群生成代理签名。然而在很多实际应用中,每个原始签名人经常需要在自己所在的组织中选择代理群,从而导致各个原始签名人需要选择不同的代理群,代表自己生成代理签名。现有的多代理多签名方案中还没有考虑这方面的需求。提出一个可以指定不同代理群的MPMS方案。在该方案中,可以指定一个多人的验证群合作验证最终签名的合法性。为证明方案的安全性,对现有的安全模型进行改进,在计算Diffie-Hellman假设的基础上,验证所提方案是安全的。与已有方案相比,本方案更加安全和有效。

In most of the existing multi-proxy multi-signature （MPMS） schemes,the same proxy group is delegated the proxy right to sign by all the original members.Nevertheless,in many practical applications,original signer often demands to designate the proxy group in his own organization which is different from others＇.It is seldom considered in the MPMS schemes.In this paper,we proposed a MPMS scheme with different proxy groups.Furthermore,in our scheme,when the final proxy signature is being authenticated,a group of specified verifiers have the access.To proved the safety of the new scheme,we improved a security model to testify that the new one is secure based on the computational Diffie-Hellman assumption.Compared with the previous scheme,the new one offers tighter safety and better computational efficiency.