Selectable privacy protection data aggregation method for fog-enhanced Internet of Things network

The invention relates to an optional privacy protection data aggregation method for a fog-enhanced Internet of Things network, the fog-enhanced Internet of Things network comprises a plurality of intelligent devices at the edge of the network, a remote cloud center and fog nodes arranged close to the intelligent devices, and the fog nodes are used for bridging the intelligent devices and the remote cloud center; the method comprises the following specific steps: initializing a system, and generating system parameters in a remote cloud center according to a given safety parameter tau; privacy selection and encryption are carried out, and corresponding ciphertexts are uploaded to the fog node according to different encryption modes selected by the intelligent device; data aggregation: the fog node screens effective data aggregation; and data decryption: the remote cloud center carries out validity verification on the data in the received aggregated data packet, the remote cloud center decrypts the ciphertext in