Power Grid Encrypted Data Range Filtering Scheme Based on Order-revealing Encryption

As the power Internet of Things (IoT) system accelerates, the IoT end devices within the power grid show an explosive growth, and generate massive electricity consumption data. While the diverse encryption technologies currently employed in the existing power grid system offer a degree of data privacy protection, they also make it difficult to filter and screen the data of the original node in the link. In addition, the traditional cryptographic technology can not resist the attack of uploading invalid data from the malicious terminal in the case that the power terminal is controlled by a malicious adversary. To address this issue, this paper presents an efficient bilinear pairing-free order-revealing encryption scheme (r-ORE) based on the modified GQ protocol, and constructs a power grid encrypted data range filtering scheme to realize the comparison of ciphertext without disclosing plaintext information. The scheme allows the IoT terminals in the power grid, such as smart meters, to encrypt the electricity consumption data before sending it to the edge server, and to filter the range of encrypted data through the query range ciphertext generated by the data center. The experimental evaluation shows that our r-ORE surpasses Cash et al.’s scheme in terms of execution costs, and its extended scheme is practical in the power grid environment.