Certificateless parallel key isolation signcryption method

Abstract

The invention discloses a certificateless parallel key isolation signcryption method. Two different and independent assistors are imported in the configuration, the two assistors help a signcryption user and an unsigncryption user to generate initial private keys, temporary private keys can be alternately updated without affecting each other, and even the frequent update of the temporary private key of the signcryption user does not increase the leakage risk of the key of the assistor. The signcryption user performs signcryption on a plaintext by using his own private key and a public key of the unsigncryption user to generate a signcryption ciphertext; and after receiving the signcryption ciphertext, the unsigncryption user performs unsigncryption on the signcryption ciphertext by using his own private key and the public key of the signcryption user to restore the plaintext. According to the certificateless parallel key isolation signcryption method disclosed by the invention, a key isolation mechanism is imported into a certificateless signcryption scheme, which not only reduces the computation and communication costs, but also satisfies the characteristics of confidentiality, non-repudiation, parallelism and strong key isolation and the like, and also supports frequent key update without increasing the key leakage risk.

Description

technical field [0001] The present invention relates to the field of information security and communication, in particular to a certificate-free parallel key isolation signcryption method, which can not only realize the confidentiality and authentication of messages in one step, but also realize the anti-key leakage function , while allowing users to perform frequent key updates to consolidate the security of the system. Background technique [0002] With the widespread use of Internet technology and communication technology in the fields of finance, medical care, services and daily life, information security and privacy protection have also become a widely concerned issue. In order to ensure the confidentiality and authentication of information in the communication process, the confidentiality of information is generally realized by encrypting the transmitted message, and the authentication of information is realized by signing the transmitted message. In 1997, Zheng et al...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the disadvantages of the prior art, the present invention provides an efficient and safe parallel key-isolated signcryption scheme based on no certificate, which reduces the cost of expensive certificate management required by the PKI-based key-isolated signcryption scheme, and also avoids identity-based Key isolation for key escrow issues in signcryption schemes while providing frequent key update functionality without increasing the risk of key leaks