Blockchain-based anonymous authentication method for cross-trusted authority in internet of vehicles

A blockchain-based anonymous authentication method for cross-trusted authority in Internet of Vehicles, comprising the following steps:

• step 1:
• initializing a system to include a plurality of trusted authorities, wherein each trusted authority covers a trusted authority domain of a plurality of trusted authority domains, possesses independent public and private key pairs, and embeds a private key thereof into a smart contract, and a consortium blockchain of the Internet of Vehicles is constructed in each trusted authority domain with trusted authorities, roadside units, and onboard units of vehicles as nodes;
• step 2:
• registering the onboard units of vehicles and the roadside units in respective trusted authorities;
• step 3:
• when a vehicle enters a trusted authority domain, generating, by an onboard unit of the vehicle a roadside unit of the entered trusted authority domain, corresponding authentication parameters;
• and transmitting, by the roadside unit, the authentication parameters to the consortium blockchain of the Internet of Vehicles for signature verification, to obtain authenticated data signed by the consortium blockchain of the Internet of Vehicles;
• step 4:
• receiving and verifying, by the onboard unit and the roadside unit, the authenticated data, and upon successful verification, calculating, by the onboard unit, a session key;
• and
• step 5:
• transmitting, by the onboard unit, data to the roadside unit and the consortium blockchain of the Internet of Vehicles sequentially by using the session key;
• wherein the step 3 specifically comprises:
• verifying, by a user, an identity of the user to log into the onboard unit and retrieve stored secret parameters;
• computing, by the onboard unit, a first set of authentication parameters by using the secret parameters;
• receiving, by the roadside unit, the first set of authentication parameters from the onboard unit;
• computing, by the roadside unit, a corresponding second set of authentication parameters;
• sending, by the roadside unit, both the first and second sets of authentication parameters to the consortium blockchain of the Internet of Vehicles via smart contract invocation;
• and
• verifying and signing, by the smart contract, the first and second sets of authentication parameters, thereby producing the authenticated data.