Online and offline signcryption method from CLC environment to PKI environment

Abstract

The invention discloses an online and offline signcryption method from a CLC environment to a PKI environment. The method specifically comprises the following steps: initializing system parameters; key generation based on CLC and key generation based on PKI; a sending end of the CLC environment obtaining an offline ciphertext delta through point multiplication operation by using a private key of the sending end, identity information and a public key of a receiver; giving an off-line ciphertext delta and a message m, and obtaining an on-line ciphertext sigma to be output by a sending end through Hash operation and XOR operation; the receiving end of the PKI environment calculating a verification equation through point multiplication operation, hash operation and exclusive-or operation according to the online ciphertext sigma, the public key of the sending end and the private key of the receiver; if the verification is passed, receiving the ciphertext and outputting a message m; or denying and rejecting the ciphertext and outputting an error symbol. The method is suitable for the wireless sensor network with small calculation overhead and storage overhead, the confidentiality and authentication between the wireless sensor networks are realized, and certain security and privacy requirements are met.

Description

Technical field [0001] The present invention belongs to the field of secure communications, particularly to a method for online and offline Signcryption CLC from the environment to the PKI environment. Background technique [0002] The message is both confidential and secure transmission channel is one of the main goals of information security research. Conventional methods to achieve this goal is to "first signature encryption", computation and communication costs of this method is the cost of the encryption and signing and efficiency is low. In order to improve efficiency, Zheng, who put forward the concept Signcryption in 1997, the basic idea is that within a reasonable logical steps to achieve simultaneous digital signatures and public-key cryptography, computation and communication costs that must be lower than the traditional " after the first signature encryption. " However, in the embodiment Zheng user's public key can be an arbitrary string having no authenticity. The tr...

AI Technical Summary

Problems solved by technology

However, due to the operation of bilinear pairing, the efficiency of the scheme is reduced, and the scheme does not satisfy the anonymity

In 2016, Zhang proposed a heterogeneous signcryption scheme based on certificateless cryptography to traditional public key cryptography. The scheme achieves different system parameters and is closer to the actual application environment. However, due to the existence of two double-line pair operation, which reduces the computational efficiency of the scheme

[0004] The above signcryption method does not discuss the issue of online and offline communication where the sender belongs to a certificateless environment and the receiver belongs to a public key infrastructure-based environment

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