Internet of Things communication method and system with large and small space plaintext aggregation and differential security

The invention discloses an Internet of Things communication method and system with large and small space plaintext aggregation and differential security. A credible authority is responsible for managing the whole system; a control center is responsible for integrating, processing and analyzing real-time report data of a user and providing comprehensive intelligent service; A gateway is responsiblefor forwarding report data to the control center and aggregating the data; a sensing node of an Internet of Things sensing end is responsible for collecting and periodically reporting large and smallplaintext space data of a user in real time. The method comprises the following specific steps: a system initialization stage; a user data reporting stage; a security data aggregation stage; a aggregated data recovery stage. According to the invention, an algebraic structure which supports security aggregation requirements of large and small plaintext spatial data on a group is innovatively constructed; the differential p