Signcryption method from public key infrastructure environment to certificateless environment

Abstract

The invention relates to a signcryption method from a public key infrastructure environment to a certificateless 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 receiver is generated; a secret key of a public key infrastructure environment sender is generated; the public key infrastructure environment sender generates a signcryption text sigma according to system parameters, a private key and a public key of the sender, an identity and a public key of the receiver and a message m and sends results to the receiver; the certificateless environment receiver verifies the correctness of the signcryption text sigma according to the system parameters, the public key of the sender and the identity and the public key of the receiver and decrypts the signcryption text sigma by using a complete private key of the receiver. The signcryption method from the public key infrastructure environment to the certificateless environment can achieve that the sender of the public key infrastructure environment sends the signcryption text to the receiver of the certificateless environment and provides confidentiality and authentication for the receiver of the certificateless 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 public key infrastructure environment to a certificate-free environment. Background technique [0002] In 1976, Diffie and Hellman proposed the concept of public key cryptosystem. Compared with the symmetric cryptosystem, the public key cryptosystem has two significant advantages: key distribution is simple, and digital signature is easy to realize. Public key cryptography has two keys, a public key and a private key. The public key can be made public, and the private key is kept secret. Since the public key has no direct relationship with the user's identity, a trusted third party—the Certificate Authority (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 set of Public Key Infrastructure (Public Key Infrastructure, hereinafte...

AI Technical Summary

Problems solved by technology

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

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