Wireless Sensor Networks (WSNs) are increasingly involved in many applications. However, communication overhead and\nenergy efficiency of sensor nodes are the major concerns in WSNs. In addition, the broadcast communication mode of WSNs\nmakes the network vulnerable to privacy disclosure when the sensor nodes are subject to malicious behaviours. Based on the\nabovementioned issues, we present a Queries Privacy Preserving mechanism for Data Aggregation (QPPDA) which may reduce\nenergy consumption by allowing multiple queries to be aggregated into a single packet and preserve data privacy effectively by\nemploying a privacy homomorphic encryption scheme. The performance evaluations obtained from the theoretical analysis and\nthe experimental simulation show that our mechanism can reduce the communication overhead of the network and protect the\nprivate data from being compromised.
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