【摘要】 首先描述了几类特殊数字的签名体制,介绍了代理签名、群签名、盲签名和多重签名产生的背景与现状,对每一类签名体制进行了细分,给出这几类签名体制的典型签名方案,最后指出了这几类签名体制的相互结合和借鉴,并且对未来的研究方向进行了展望.更多还原

【Abstract】 This paper first describes present situation and progress of several especial signatures-proxy signature,group signature,blind signature,multi-signature.Then we introduce conception and categories of every signature.We give some typical signature schemes.Finally,we show existent problems of several especial mixed signatures and look into the future of signature.更多还原