In wireless sensor networks（ WSNs）

how to aggregate data efficiently is the major challenge for applications of the Internet of things. However

in existing schemes for this challenge

sensor nodes usually suffer from high energy consumption of communication and calculation

and privacy and integrity of datas cannot be protected effectively. Aimed at these problems

a data aggregation scheme based on clustering is proposed

algebraic equation is used to compute intermediate data aggregation value of sensor and digital signature is used for ID authentication of sensors between clusters. Experimental results show that the proposed scheme effectively reduce energy consumption of calculation and communication

and ensure privacy and integrity of datas.