Vehicle to grid (V2G) network plays an important role, which can realize the electric energy transaction between electric vehicle (EV) and smart grid (SG). However, sensitive information on the identity of EVs and the transaction bills may be leaked. In this paper, a privacy-preserving energy trading scheme based on blockchain is proposed, which can protect private information such as transaction amount and identities of EVs. Specifically, elliptic curve encryption and digital signature are used to realize the confidentiality and integrity of transaction information, respectively. At the same time, we also use blockchain and smart contract technology to ensure the immutability of transaction amount between EVs and SG. Finally, we prove the security of the proposed scheme and evaluate its efficiency.
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