An Efficient Fair Exchange Privacy-Preserving Protocol for V2G Based on Blockchain

With the continuous progress of new energy technology, new energy vehicles have gradually become the mainstream. More and more new energy vehicles (EV) are put into use, which not only brings challenges to the current smart grid (SG) system, but also brings brand new opportunities. Vehicle-to-grid (V2G) is a new technology, which not only realizes the power transmission from the grid to the Vehicle, but also realizes the auxiliary power transmission ability from the vehicle to the grid. But the privacy problem and the fairness of the transaction are still an urgent problem to be solved. Privacy issues can lead to the user's privacy being obtained and analyzed by malicious participants, resulting in the user's property being threatened. Fair exchange means that in the transaction process, if one party is malicious, the honest party has no loss or the loss is negligible; Or if both parties are malicious or honest, there is no loss for either party. This paper proposes a Vehicle-to-grid privacy protection fair exchange system based on blockchain. Homomorphic commitment and hashchain are introduced to achieve privacy protection and fair exchange.