Abstract: Privacy exposure,information tampering and false data injection are serious challenges in wireless sensor network data aggregation．How to protect the privacy and integrity of data has become a hot research issue in data aggregation．To detect any malicious data tampering and protect data privacy in data aggregation,a novel Privacy-preserving dynamic Integrity-verification(PDI) algorithm was proposed．The PDI algorithm uses the data is perturbation to protect data privacy．In order to protect the integrity of privacy data,the PDI algorithm generates monitoring nodes between the current aggregator and its parent node depending on the network structure dynamically．Therefore,if the data is tampered by the aggregator,it can be detected at the early stage．The simulation results show that the PDI algorithm can reali-ze privacy preserving and integrity verification with less communication and computation overhead．

Key words: Wireless sensor network,Data aggregation,Privacy preserving,Integrity verification,Data perturbation