可追踪身份的基于属性的多重签名方案

Identity Traceable Attribute-based Multi-signature Scheme

在电子商务和电子政务领域中,针对多人联合签署同一文件以及追究签名者责任的需求,提出了一种可追踪身份的基于属性的多重签名方案.采用基于属性的多重签名(Attribute based Multi-signature,ABMS),解决了多人联合签署同一文件问题.将可追踪身份的思想引入到ABMS中,有效解决了签名者滥用签名,在保证签名者隐私性的同时实现了其身份的可追踪性.具体构造了该方案并在子群判定假设和计算性Diffie-Hellman假设下证明了该方案在标准模型下是不可伪造的.分析表明,与已有ABMS方案相比,所提方案具有身份可追踪性,适用于解决多签名者追责问题.

In the domain of electronic commerce and electronic government affairs, we may face the situation of signing the same document by a group of people. Moreover, we need the ability of investigating the accountability of the signer. To meet such requirements, we propose an identity traceable attribute-based multi-signature scheme. The attribute-based multi-signature （ABMS） can solve the problem of multi-signing the same document. By integrating the thought of traceability, we successfully prevent the signer from abusing his identity. Under the premise of ensuring the pri- vacy of the signer, we achieve the goal of traceability. On the basis of the subgroup decision and the computational Diffie-Hellman （CDH） assumptions, we prove that the scheme is unforgeable in the standard model. Compared with the existing schemes, our scheme is traceability and suitable for solving the problem of responsibility of multi-signers.