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针对部分已有基于身份的泛指定验证者签名(UDVS)存在签名可授权问题,构造了一个满足不可授权性的基于身份的UDVS方案。给出基于身份的UDVS形式化安全模型,即UDVS安全要同时满足签名不可伪造性、不可转移性和不可授权性。基于该模型并在基于身份密码体制框架下,方案构造以双线性对为基本工具,并采用Barreto-Libert-McCullagh-Quisquater签名为构建模块。在随机预言模型下,证明方案满足不可转移性和不可授权性,方案的签名不可伪造性可归约到求解q-强Diffie-Hellman问题。
In view of the existing authorization of signatures of some existing identity-based UDVS signatures, an identity-based UDVS scheme satisfying non-authoritativeness is constructed. An identity-based UDVS formal security model is given, that is, UDVS security needs to satisfy the signature unforgeability, non-transferability and non-authorization. Based on this model and under the framework of identity-based cryptography, the scheme is constructed with bilinear pairings as the basic tools and a Barreto-Libert-McCullagh-Quisquater signature as a building block. Under the random oracle model, the proof scheme satisfies the irreducibility and non-authorization, and the scheme unforgeability can be reduced to solving the q-strong Diffie-Hellman problem.