Wireless Sensor Networks (WSNs) have been wildly used in our daily life. How to collect data efficiently and keep users' privacy are more and more important. The goal of this paper is to find a new effective scheme to solve this problem. In this paper, I propose a modified scheme for privacy preserving data aggregation which is inspired by CPDA. This scheme could aggregate data without revealing any private information and consume less resources than CPDA. In addition, I made a comparison with CPDA in computation overhead and communication overhead. At last, the simulation results are presented which show the efficacy and efficiency of this scheme.
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