Signcryption method from certificateless environment to public key infrastructure environment

Abstract

The invention discloses a signcryption method from a certificateless environment to a public key infrastructure environment, and belongs to the field of secret communications. The signcyption method comprises the steps that system initialization of the certificateless environment is conducted; system initialization of the public key infrastructure environment is conducted; a secret key of a certificateless environment sender is generated; a secret key of a public key infrastructure environment receiver is generated; the certificateless environment sender generates a signcryption text sigma according to system parameters, a complete private key and public key of the sender, a public key of the receiver and a message m and sends results to the receiver; the public key infrastructure environment receiver verifies the correctness of the signcryption text sigma according to the system parameters, an identity and the public key of the sender and the public key of the receiver and decrypts the signcryption text sigma by using a private key of the receiver. The signcryption method from the certificateless environment to the public key infrastructure environment can achieve that the sender of the certificateless environment sends the signcryption text to the receiver of the public key infrastructure environment and provides confidentiality and authentication for the receiver of the public key infrastructure environment; the features that the authentication can be verified publicly and a sharing system and common parameters of the receiver and the sender are not necessary are achieved.

Description

technical field [0001] The invention belongs to the technical field of information security, and in particular relates to a heterogeneous signcryption method from a certificateless environment to a public key infrastructure environment. Background technique [0002] The traditional public key cryptosystem is based on the public key infrastructure (Public Key Infrastructure, hereinafter referred to as PKI). In this cryptographic system, the public key has no direct relationship with the user's identity, so a trusted third party - Certificate Authority (Certificate Authority, hereinafter referred to as CA) is required to issue a certificate to bind the user's public key with its identity information , so it is necessary to establish a PKI system. Because the establishment of PKI requires high costs, this hinders the widespread use of PKI-based public key cryptosystems, making it only suitable for systems with a moderate number of users. [0003] The identity-based cryptosyst...

AI Technical Summary

Problems solved by technology

Moreover, if the sender belongs to a non-certificate environment and the receiver belongs to a PKI environment, the above methods will not work

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