一类增强的代理多重签名体制

在代理多重签名体制中，多个原始签名人可以分别将签名权力委托给各自的代理签名人，再由这些代理签名人联合生成一个代表所有原始签名人的数字签名．文中对现有的这种代理多重签名体制进行分析、改进，利用带委任状的部分代理机制，构造出更安全有效的方案．安全分析表明：新方案生成的代理签名包含代理签名人的真正信息，克服了抵赖问题；可以在委任状中限制代理签名人的签名能力，或在委任状中指定合法代理签名人的集合以防止代理签名人将签名能力向其他人转移，阻止了签名能力的滥用．

An Improved Proxy Multi-Signature Scheme

Plural original signers can delegate their signing capabilities to proxy signers respectively to create a proxy signature on behalf of all original signers in a proxy multi-signature scheme. By partial delegation with warrant, this paper improved the previous proxy multi-signature scheme to a stronger and more efficient scheme. The security analysis shows that the new scheme is nonrepudiable because the authentic information of proxy signers is included in a valid proxy signature. It also prevents proxy signers from any misuse of signing capabilities by confining the signing capabilities of proxy signers and by designating a set of valid proxy signers in warrant.