【摘要】 <正> 1 引言门限数字签名是门限密码学的一个重要分支。将公司或团体的数字签名密钥以(t,n)门限方案分散给多人管理有多种好处。例如,(1)攻击者要想得到签名密钥必须得到t个“部分密钥”(亦称共享),这通常比较困难。(2)即使某个或某些部分密钥丢失,比如,存放某部分密钥的地点发生火灾,整个密钥也不会丢失。(3)实现权力分配,避免滥用职权:某些重大决定可能需要决策者的某些特定组合集体签署才能生效,签名密钥的共享使此变为可能。更多还原

【Abstract】 This paper comprehensively introduces and analyzes Shamir Secret Sharing, Pedersen’s Verifiable Secret Sharing based on ECC, verifiable secret sharing without a trusted center based on ECC and an ElGamal digital signature scheme based on ECC. Based on the theoretical introduction, an ElGamal.type(t, n) threshold digital signature scheme Based on ECC is designed. The performance of the scheme is analyzed. And an application based on the scheme is described. In the scheme, a trusted center to deal with the sharing secret is eliminated. No secret communication is required in the signature issuing phase. The scheme is characterized by excellent security as well as high efficiency.更多还原