The invention relates to a
power grid data privacy protection method based on CRT optimization Paillier
encryption, and the method comprises the steps: a TA initializes a
system common parameter, and distributes a secret key for a
cloud server; the intelligent electric meter regularly collects
power consumption data of a user, encrypts the collected
power consumption data according to the
system public parameters, generates a data report and uploads the data report to the
fog node; after receiving the data report, the
fog node responsible for managing the intelligent electric meter verifies the legality of the data according to the public parameters of the
system, and after the
verification is passed, the
fog node aggregates the received encrypted
power consumption data, generates a data report and uploads the data report to the
cloud server; the
cloud server verifies the legality of the data according to the system public parameters after receiving the data report, decrypts the aggregated encrypted power utilization data by using the key of the cloud
server after the
verification is passed, and carries out fragmentation storage on the decrypted power utilization data; the control center initiates a query request to the cloud
server, and the cloud
server retrieves the stored data fragments according to query conditions and returns a query result to the control center. Through cryptographic optimization and hierarchical cooperation, the
data processing efficiency is remarkably improved, the anti-
attack ability and reliability of the system are enhanced, and a systematic solution is provided for safe and efficient management of
mass data of the
smart power grid.