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Certificateless multi-message multi-receiver signcryption method with renewable key

A multi-receiver, key update technology, applied to the public key and key distribution of secure communication, can solve complex problems, achieve the effect of improving security, solving the problem of repeated registration, and reducing computational and communication overhead

Active Publication Date: 2021-06-08
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the complex deficiency of the existing certificateless multi-message multi-receiver signcryption method, the present invention provides a non-certificate multi-message multi-receiver signcryption method with renewable keys

Method used

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  • Certificateless multi-message multi-receiver signcryption method with renewable key
  • Certificateless multi-message multi-receiver signcryption method with renewable key
  • Certificateless multi-message multi-receiver signcryption method with renewable key

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Embodiment Construction

[0092] Glossary:

[0093] U: User. Including sender S and receiver R i , i=1,2,...,n, n represents the receiver R randomly selected by the sender S from the registered users U i Number of;

[0094] KGC: Key Generation Center, which is a trusted third party, is responsible for generating public and private keys of user U;

[0095] η: the security parameter selected by the key generation center KGC;

[0096] q: a large prime number selected by the key generation center KGC;

[0097] f q : A finite field selected by the key generation center KGC;

[0098] E: The key generation center KGC is in the finite field F q An elliptic curve selected on

[0099] P: A generator of the elliptic curve E selected by the key generation center KGC;

[0100] s: the system master key selected by the key generation center KGC;

[0101] P pub : The system public key generated by the key generation center KGC;

[0102] ∈: limited domain symbol, such as a∈B, means that a belongs to B;

[...

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Abstract

The invention discloses a non-certificate multi-message multi-receiver signcryption method with renewable keys, which is used to solve the complex technical problem of the existing non-certificate multi-message multi-receiver signcryption method. The technical solution is that the user first registers to generate his own public key and private key. When the user needs to update the key, he will re-select a random number, and then generate a new verification share and key update verification parameters. Then, through the public channel, the It is sent to the key generation center KGC, and the key generation center KGC verifies whether the two satisfy the verification equation after receiving it, and if so, replaces the original verification share with the new verification share, otherwise the update fails. After KGC updates the public key, the user calculates and updates his own private key. In the signcryption process, the sender's identity information is encrypted together with the plaintext, and a signature parameter is generated with the sender's private key; after the sender's identity information is decrypted, the corresponding public key is obtained to verify the signature parameter. The method is simple and practical.

Description

technical field [0001] The invention relates to a non-certificate multi-message multi-receiver signcryption method, in particular to a non-certificate multi-message multi-receiver signcryption method with renewable keys. Background technique [0002] The document "Patent Application No. 201710815077.8 Chinese Invention Patent" discloses a truly anonymous certificateless multi-message multi-receiver signcryption method. The user of this method selects a secret value as a partial private key, and uses this secret value to calculate the partial private key. public key, and then send part of the public key and its own identity information to the key generation center KGC. The key generation center generates the corresponding part of the private key and the corresponding part of the public key verification parameters, and then sends them to the user through a secure channel. After the user receives the corresponding part of the private key and the corresponding part of the publi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L9/32H04L9/30H04L9/08
CPCH04L9/083H04L9/0869H04L9/0891H04L9/3066H04L9/3236H04L9/3247H04L2209/72
Inventor 庞辽军许婷婷魏萌萌李慧贤
Owner XIDIAN UNIV