Strong Designated Verifier Signature Method Based on Multivariate Public Key Cryptosystem

A technology for specifying verifiers and multivariable public keys, applied in the field of strong specified verifier signatures based on multivariable public key cryptosystems, which can solve problems such as no longer secure, and achieve correctness, security, computing efficiency, and privacy enhancement. Effect

Inactive Publication Date: 2016-08-10
江苏星地通通信科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a strong designated verifier signature method based on multi-variable public key cryptosystem, to solve the problem that the prior art is no longer safe under quantum computing

Method used

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  • Strong Designated Verifier Signature Method Based on Multivariate Public Key Cryptosystem
  • Strong Designated Verifier Signature Method Based on Multivariate Public Key Cryptosystem
  • Strong Designated Verifier Signature Method Based on Multivariate Public Key Cryptosystem

Examples

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Embodiment 1

[0060] Example 1. Strongly designated verifier signature method based on pFLASH signature system based on multivariate pFLASH is projected C *- A special case of the scheme, the selected parameter is q=2 4 , n=74, θ=11, r=22 and s=1. So far, pFLASH is still a very safe and efficient signature system. Here is a specific example of a strong designated verifier signature based on the pFLASH signature system. The specific steps are as follows:

[0061] Step 1. Generate System Parameters

[0062] The system parameters are (k=GF(2 4 ), n=74, θ=11, r=22, s=1, H). k=GF(2 4 ) is a finite field, n-r=52 is the number of multivariate equations, n-s=73 is the number of variables, H:{0,1} * →k 74 It is a cryptographically secure one-way collision-resistant hash function.

[0063] Step 2. Key Generation

[0064] user's public key is from k 73 to k 52 The quadratic multivariate polynomial component of the private key SK={L 1 ,F,L 2}, where F is the reversible central map, L 1 ,...

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Abstract

The invention aims to provide a strongly designated verifier signature method based on a multivariate public key cryptosystem. The method comprises the following steps of generating a system parameter, generating a key, designating a verifier signature generating algorithm, and designating a verifier signature verification algorithm and the like. Through the method, the privacy of a signer is enhanced; nobody can verify the effectiveness of the signature except the designated verifier, the verifier cannot randomly propagate the signature to a third party; and the method has correctness, unforgeability and high efficiency.

Description

technical field [0001] The invention belongs to the technical field of information security, and relates to a strong designated verifier signature method based on a multivariable public key cryptosystem. Background technique [0002] General digital signatures are publicly verifiable, that is, any user can use the signer's public key to verify the validity of the signature. With actual needs, the signer often hopes that only designated users can verify the signature. For example, in the bidding process, the company only wants the government to get the bidding document and verify its legality, and the government wants the bidding documents between companies to be transparent, so that it is entirely possible for him to leak the bidding documents and signatures, and the competing companies will definitely adjust themselves accordingly bid for the project. In order to solve this problem, Jakobsson et al. proposed the designated verifier signature scheme for the first time in 19...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L9/32
Inventor 王尚平
Owner 江苏星地通通信科技有限公司
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