Credible node joining method in VANET based on block chain

Abstract

The invention discloses a credible node joining method in VANET based on a block chain, belongs to the field of VANET safety, and aims to improve traffic jam and assist safe driving. If the vehicle isa malicious node, hidden dangers are buried for traffic safety, for example, the malicious node scatters false or attack data information, so that the reliability of related data information receivedby the vehicle is difficult to guarantee. And if the malicious node is rejected when the malicious node is added into the VANET, the security can be improved to a great extent. The invention providesa credible node joining method in VANET based on a block chain, and a roadside unit performs distributed verification on an applied vehicle. the method comprises: firstly, verifying whether the vehicle has a legal identity or not; then, verifying the integrity of the vehicle-mounted platform by utilizing a trusted computing technology; and finally, evaluating the reputation value of the vehicle in the last certificate validity period, namely evaluating whether the vehicle is a malicious node or not through historical performance; and allowing the verified vehicle to join, otherwise refusing.

Description

technical field [0001] This patent belongs to the security field of vehicle ad hoc network (VANET), and studies a blockchain-based trusted node joining method in VANET, aiming at detecting malicious vehicle nodes and solving security problems caused by malicious nodes. Background technique [0002] Cryptography systems are generally divided into two types: symmetric cryptography and asymmetric cryptography. [0003] (1) Symmetric cryptographic system: In order to ensure the confidentiality of data, the shared key K is shared by the sender and the receiver, and the sender uses an encryption algorithm to encrypt plaintext m into ciphertext c=EK(m) and send it to the receiver . After receiving the ciphertext, the receiver uses the decryption algorithm to obtain the plaintext m=DK(c) with the same key K. The AES encryption algorithm is a typical symmetric encryption algorithm. [0004] (2) Asymmetric cryptographic system: In an asymmetric cryptographic system, the network sub...

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Problems solved by technology

However, due to the lack of systems and technologies that can support programmable contracts and the lack of a safe and trusted execution environment, the working theory of smart contracts has not been realized

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