Linkable network ring signature method based on attributes

Abstract

The invention discloses a linkable network ring signature method based on attributes. The method mainly comprises the steps that in the signature stage, guaranteeing a fact that signatures with the same link label have linkability in the mode that the link label is generated by randomly selecting parameters, the linkability can be determined by a signer independently, and whether the two signatures are signed and issued by the same person can be proved on the premise that the identity of the real signer is not revealed; and injecting the identity identifier into each user private key in the attribute key generation stage, so that the method can resist collusion attacks. The method is strong in anonymity and high in security, can effectively solve the problem of secondary signature existingin electronic cash, electronic voting and the like, and provides anonymous identity authentication and access control functions.

Description

technical field [0001] The invention belongs to the technical field of digital signatures in cryptography, and relates to a network anonymous identity authentication method supporting chainability. Background technique [0002] As a new type of asymmetric cryptography, attribute-based signature has the advantages of strong expressive ability, flexible use, and convenient identity concealment. It is especially suitable for providing anonymous identity authentication in the Internet, and has attracted more and more scholars' attention. This system divides the population at a fine-grained level through attributes, expresses the identity in the original identity-based signature system as an attribute set, and adds the concept of access structure to the identity-based signature system, if and only if the user attribute set Only when the access structure is satisfied can the attribute private key be used for signature. Compared with the identity-based signature system, the attrib...

AI Technical Summary

Problems solved by technology

However, this method fails to achieve linkability, cannot determine whether two signatures are signed by the same person, and is difficult to solve the problem of secondary signatures in the Internet field such as electronic cash, electronic elections, and electronic spending.

In addition, this signature method also has the problem of being unable to resist collusion attacks. Users with complementary attributes can still generate legal signatures that they cannot generate individually by combining keys.

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