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Witness-Indistinguishable Arguments with ∑-Protocols for Bundled Witness Spaces and Its Application to Global Identities

机译:捆绑见证空间的带有Σ协议的见证不可区分的论证及其在整体身份中的应用

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We propose a generic construction of a ∑-protocol of commit-and-prove type, which is an and-composition of ∑-protocols on the statements that include a common commitment. Our protocol enables a prover to convince a verifier that the prover knows a bundle of witnesses that have a common component which we call a base witness point. When the component ∑-protocols are of witness-indistinguishable argument systems, our ∑-protocol is also a witness-indistinguishable argument system as a whole. As an application, we propose a decentralized multi-authority anonymous authentication scheme. We first define a syntax and security notions of the scheme. Then we give a generic construction of a decentralized multi-authority anonymous authentication scheme. There a witness is a bundle of witnesses each of which decomposes into a common global identity string and a digital signature on it. We mention an instantiation of the generic scheme in the setting of bilinear groups.
机译:我们提出了提交和证明类型的∑协议的泛型构造,它是包含共同承诺的语句上∑协议的和组成。我们的协议使证明者可以说服验证者证明该证明者知道一堆见证人,这些见证人具有共同的组成部分,我们称之为基本见证人点。当组成∑协议的是无法区分证人的论点系统时,我们的∑协议从整体上来说也是一个不能证人的论证系统。作为一种应用,我们提出了一个分散的多机构匿名身份验证方案。我们首先定义该方案的语法和安全性概念。然后,我们给出了分散的多机构匿名身份验证方案的一般构造。见证人是一堆见证人,每个见证人都分解为一个通用的全局标识字符串和上面的数字签名。我们在双线性组的设置中提到了通用方案的实例化。

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