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Certificateless Ring Signcryption Method Based on Multiplicative Group

A certificateless, ring signcryption technology, applied in the field of network information security

Active Publication Date: 2020-11-10
XIAN UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the above-mentioned prior art, and provide a multiplicative group-based certificateless ring signcryption

Method used

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  • Certificateless Ring Signcryption Method Based on Multiplicative Group
  • Certificateless Ring Signcryption Method Based on Multiplicative Group
  • Certificateless Ring Signcryption Method Based on Multiplicative Group

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] A large prime number q selected by the key generation center, q is 2 192 -2 64 -1 as an example, such as figure 1 As shown, the steps of the multiplicative group-based certificateless ring signcryption method in this embodiment are as follows:

[0054] A. System initialization

[0055] (A1) The key generation center selects a large prime number q of k bits, and this embodiment adopts q as 2 192 -2 64 -1, k is a security parameter, a finite positive integer, set G 1 ,G 2 ,G 3 are three q factorial cyclic groups, g is the group G 1 A generator of , e is G 1 ×G 2 →G 3 is a bilinear map.

[0056] (A2) The key generation center selects three cryptographically secure hash functions H 0 、H 1 、H 2 :H 0 : h 1 : h 2 : Where l1 is the length of the message, l2 is the length of any identity, n is the number of ring members, which is a finite positive integer, Z q * is {1,2,...,2 192 -2 64 -2}, is a message of length l1 consisting of 0s and 1s, is an i...

Embodiment 2

[0098] A large prime number q selected by the key generation center, q is 2 224 -2 96 +1 as an example, the steps of the certificateless ring signcryption method based on the multiplicative group are as follows:

[0099] A. System initialization

[0100] (A1) The key generation center selects a large prime number q of k bits, and this embodiment adopts q as 2 224 -2 96 +1, k is a security parameter, a finite positive integer, set G 1 ,G 2 ,G 3 are three q factorial cyclic groups, g is the group G 1 A generator of , e is G 1 ×G 2 →G 3 is a bilinear map.

[0101] (A2) The key generation center selects three cryptographically secure hash functions H 0 、H 1 、H 2 :H 0 : h 1 : h 2 : where l 1 is the message length, l 2 is the length of any identity, n is the number of ring members, which is a finite positive integer, Z q * is {1,2,...,2 224 -2 96}, is a length l composed of 0 and 1 1 news, is a length l composed of 0 and 1 2 identity of, It is n+1...

Embodiment 3

[0108] A large prime number q selected by the key generation center, q is 2 256 -2 224 +2 192 +2 96 +1 as an example, the steps of the certificateless ring signcryption method based on the multiplicative group are as follows:

[0109] A. System initialization

[0110] (A1) The key generation center selects a large prime number q of k bits, and this embodiment adopts q as 2 256 -2 224 +2 192 +2 96 +1, k is a security parameter, a finite positive integer, set G 1 ,G 2 ,G 3 are three q factorial cyclic groups, g is the group G 1 A generator of , e is G 1 ×G 2 →G 3 is a bilinear map.

[0111] (A2) The key generation center selects three cryptographically secure hash functions H 0 、H 1 、H 2 :H 0 : h 1 : h 2 : where l 1 is the message length, l 2 is the length of any identity, n is the number of ring members, which is a finite positive integer, Z q * is {1,2,...,2 256 -2 224 +2 192 +2 96}, is a length l composed of 0 and 1 1 news, is a length l...

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Abstract

A certificateless ring signcryption method based on a multiplicative group, which consists of system initialization, generation of a user's private key and public key, generation of a part of the user's private key, ring signcryption, and decryption of the signcryption. The multiplicative group-based encryption and anonymous authentication method is adopted in the ring signcryption step, which solves the complex certificate management problem in the traditional public key infrastructure and the key escrow problem in identity cryptography and anonymity in the certificateless mode Communication issues; Based on the theoretical basis of certificateless public key cryptography and multiplicative cyclic groups, it improves security, avoids the dependence on secure channels, certificateless management and key escrow problems, and can resist adaptive chosen ciphertext attacks and adaptive Sexually selected message attack, suitable for network information security application environment. The invention has the advantages of good security and low computational complexity, and can be applied in the field of network information security.

Description

technical field [0001] The invention belongs to the technical field of network information security, and in particular relates to a certificateless public key encryption system and a signcryption method. Background technique [0002] Certificateless ring signcryption can simultaneously achieve confidentiality and anonymous authentication, and is one of the most important applications of public key cryptosystems. Certificateless ring signcryption has become an important means to realize encryption and anonymous authentication at the same time, and the security is getting more and more perfect. However, most certificateless ring signcryption methods using bilinear pairings are based on one additive cyclic group and one multiplicative cyclic group, and there is currently no certificateless ring signcryption method based on three multiplicative cyclic groups. Certificateless ring signcryption is superior to ring signcryption in the traditional public key mode in terms of commun...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L9/06H04L9/32H04L29/06
CPCH04L9/0643H04L9/3236H04L9/3255H04L63/0442H04L2209/72
Inventor 王之仓俞惠芳
Owner XIAN UNIV OF POSTS & TELECOMM
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