Democratic signature method with threshold tracking

Abstract

The invention provides a democracy group signature method which belongs to an electric commercial application field and is provided with a threshold traceability. The method according to the invention comprises the following procedures: a procedure 1, forming a group with n members in the system, generating all open parameters required by the system by a trusted center, and shearing all open parameters to all group members; a procedure 2, using the open parameter by the group member IDi, generating a private public key yi and a private key xi, registering the public key in the trusted center and disclosing, secretly storing the private key by itself; a procedure 3, generating a democracy group signature by a certain group member IDk in the group U with the private key and the public key of all group members in U representing group U, wherein a democracy signature is a binary group (share, sig); a procedure 4, when a random signature receiver receives the democracy group signature (share, sig) which is generated by the group U for the information, determining whether the signature is effective; and a procedure 5, collaborating and alternating a plurality of group members in the group U, and restoring the identity of the real signatory generating the signature. The invention eliminates a centralization group manager, and a plurality of group members collaborate and calculate theidentity of the real signatory.

Description

technical field The invention relates to a method in the technical field of telecommunication, in particular to a democratic group signature method with threshold traceability. Background technique Electronic documents include any file generated or stored on a computer, such as emails, works, contracts, images, etc. Digital signatures are used to authenticate information and securely bind the contents of an electronic document to the signer, more precisely, to the signer's public key. Only a real signer can generate a valid signature, and anyone can verify the signature generated by the signer to be sure that the document was indeed signed by the signer. Digital signature is the core technology to realize e-commerce, e-government and other information services. In practical applications, electronic transactions can generally be decomposed into a series of operational steps that have a chronological or causal relationship with each other, and each operational step is comple...

AI Technical Summary

Problems solved by technology

However, these systems all have a common defect: the system must use a trusted group manager to achieve traceability

Democratic group signatures are especially suitable for scenarios such as enterprise alliances in the information age, but one of the main disadvantages of this democratic group signature method is that any member of the group can perform tracking operations. This is a very loose requirement and it is easy to bring Abuse of tracking capabilities, etc.

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