Identity-based threshold ring signature method

Abstract

An identity-based threshold ring signature method comprises the following steps: (1), system establishment; (2), private key extraction; (3), signature; and (4), verification. The method provided by the invention is established under a standard model and has better security compared with a scheme designed under a random predictive model.

Description

technical field [0001] The invention relates to a ring signature method, in particular to an identity-based threshold ring signature method. Background technique [0002] In the traditional public key cryptosystem, an important issue is the authenticity of the public key. Generally speaking, in order to apply public key cryptography algorithms in the real world, there needs to be a mechanism that can verify the connection between a certain public key and a certain subject's identity at any time. The usual method is to establish a public key infrastructure, and bind the public key with the user's identity through the public key digital certificate issued by its certification center. In such systems based on public key digital certificates, before using the user's public key, people need to obtain the user's public key digital certificate and verify the correctness and legitimacy of the certificate. This requires a larger storage space to store the public key certificates of...

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Problems solved by technology

However, for the security proof based on the random oracle model, it is necessary to assume that the cryptographic hash function used in the public key cryptosystem has the security properties of the random oracle machine, but the security cryptographic scheme under the random oracle model is not necessarily safe in the actual environment , and the security proof based on the standard model only depends on the difficulty of the trapdoor one-way function contained in the public key cryptosystem

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