Distributed public key infrastructure method based on block chain and attribute signature

The invention belongs to the technical field of passwords, and particularly relates to a distributed public key infrastructure method based on a block chain and an attribute signature. According to the method, a single-node CA of a traditional public key infrastructure is changed into a multi-node CA which is arranged on a block chain and carries out certificate issuing/verification cooperatively, and cryptographic algorithms such as signature and zero-knowledge proof based on attributes are introduced, so that the identity represented by a certificate is finer in granularity; the method comprises the steps of system initialization, user initialization, certificate signing and issuing, certificate verification, certificate revocation and the like. The method is a universal scheme, is suitable for various certificate-based identity authentication scenes, enables the identity to be more stereoscopic by utilizing the coverage of attributes, has fine-grained identity authentication and certain fault tolerance, re