Identity-based threshold ring signature method

A threshold ring and identity technology, which is applied in the field of identity-based threshold ring signatures, can solve problems such as the difficulty of trapdoor one-way functions in public key cryptography

Inactive Publication Date: 2012-09-19
孙华 +4
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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 cryptogra

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Embodiment Construction

[0030] Such as figure 1 As shown, the present invention is an identity-based threshold ring signature method, comprising the following steps:

[0031] An identity-based threshold ring signature method, comprising the following steps:

[0032] S1. System establishment: randomly select parameters, generate system parameters and corresponding master keys, where system parameters are public parameters, and the specific steps are:

[0033] Let G, G T is a cyclic group whose order is a prime number p, e: G×G→G T is a bilinear map, two collision-free hash functions and Output the identity ID and message m of any length with a length of n u and n m the bit string;

[0034] The trusted third party randomly selects the parameter α∈Z p , generating element g∈G, computing g 1 =g a . Randomly choose the parameter g 2 , u′,m′∈G,n u dimension vector no m dimension vector where u i , m i ∈ R G, then the system parameters are param = ...

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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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Application Information

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IPC IPC(8): H04L9/32H04L9/30
Inventor 孙华王爱民梁燕军郭丽孙虹
Owner 孙华
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