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Certificateless multi-receiver signcryption method with multivariate-based cryptosystem

A multi-receiver, multi-variable technology, applied in the field of information security, can solve problems such as poor security, and achieve the effects of high security, high security, and small amount of calculation

Inactive Publication Date: 2012-12-05
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the disadvantages of poor security of the existing certificateless signcryption method, the present invention provides a certificateless multi-receiver signcryption method based on a multivariable cryptosystem

Method used

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  • Certificateless multi-receiver signcryption method with multivariate-based cryptosystem
  • Certificateless multi-receiver signcryption method with multivariate-based cryptosystem
  • Certificateless multi-receiver signcryption method with multivariate-based cryptosystem

Examples

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Embodiment Construction

[0027] Symbolic descriptions of variables and operations in the examples.

[0028]

[0029]

[0030] For the actual broadcast communication environment, this example implements a multi-variable non-certificate multi-receiver signcryption method, which is implemented according to the following steps:

[0031] Step 1. Generate system parameters.

[0032] 1) The Key Generator Center (hereinafter referred to as KGC) selects the secret positive integer parameter s, and KGC generates a large prime number p and a positive integer l;

[0033] 2) Choose a finite field G with order q, where q=p l ;

[0034] 3) Order G n is the n times expansion of the finite field G;

[0035] 4) Let the positive integer g be the number of equations in the multivariate equation system;

[0036] 5) Select H 1 :G×G×G n →G n , H 2 :G→G n A cryptographically secure collision-resistant one-way irreversible hash function. The system parameters are {G, l, g, n, q, p, H 1 ,H 2}.

[0037] Step...

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Abstract

The invention discloses a certificateless multi-receiver signcryption method with a multivariate-based cryptosystem. The certificateless multi-receiver signcryption method is used for solving the technical problem of poor security of an existing certificateless signcryption method. The technical scheme includes that the method includes: firstly, using a key generation center to generate system parameters, and selecting a secure multivariable encryption algorithm to generate keys; and enabling a user U to obtain system private keys of the key generation center and generate the private keys to user keys prior to that a user Alice with the identity IDA sends signcryption messages to a user group L={ID1, ID2,...,IDt}, and accepting or refusing ciphertext sigma by means of un-signcryption. By the aid of the multivariate-based cryptosystem, high security of anti-quantum computation is achieved, and the certificateless multi-receiver signcryption method is still high in security facing attack of a quantum computer. Compared with the background art, the certificateless multi-receiver signcryption method is small in computation and high in security, has the advantages of completeness, confidentiality, unforgeability, forward security, backward security, receiver privacy protection and the like and is capable of resisting existing known attack.

Description

technical field [0001] The invention belongs to the technical field of information security, and relates to a multi-recipient signcryption method without certificates, in particular to a multi-recipient signcryption method without certificates based on a multivariable cryptographic system. Background technique [0002] In broadcast communication applications, confidentiality and authentication are the two most important issues. Usually, the method of "sign first and then encrypt" is used to process information, but the cost required by this method is the sum of the cost required for signature and encryption. less efficient. Signcryption is an important cryptographic technology that realizes two functions of encryption and digital signature at the same time, and it integrates encryption and digital signature. Signcryption improves communication efficiency and reduces computing burden, and is an ideal method for secure data transmission. [0003] The document "Selvi S S D, V...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/32H04L9/30
Inventor 李慧贤陈绪宝王楠庞辽军胡金顺杨亚芳
Owner NORTHWESTERN POLYTECHNICAL UNIV
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