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Certificate-less multi-message multi-receiver signcryption method capable of updating key

A multi-receiver and key update technology, which is applied to the public key and key distribution of secure communication, can solve complex problems

Active Publication Date: 2018-10-23
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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  • Certificate-less multi-message multi-receiver signcryption method capable of updating key
  • Certificate-less multi-message multi-receiver signcryption method capable of updating key
  • Certificate-less multi-message multi-receiver signcryption method capable of updating 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 certificate-less multi-message multi-receiver signcryption method capable of updating a key, used for solving the technical problem that the existing certificate-less multi-message multi-receiver signcryption method is complex. The technical scheme is as follows: a user performs registration to generate a public key and a private key himself at first; when needing to perform key updating, the user re-selects a random number, generates the new verification share and key updating verification parameters, and then, sends the new verification share and key updating verification parameters to a key generation centre KGC through a public channel; after receiving the new verification share and key updating verification parameters, the KGC verifies whether the two satisfya verification equation or not; if so, the original verification share is replaced by the new verification share; otherwise, updating fails; when the KGC updates the public key, the user calculates and updates the private key himself; in a signcryption process, the identity information and the plaintext of a sender are encrypted together; a signature parameter is generated by utilization of the private key of the sender; and, after the identity information of the sender is obtained by decryption, corresponding public key verification signature parameters are obtained. The method is simple andpractical.

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 Applications(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
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