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Network monitoring is a basic component for intrusion detection and also an energy-expensive task. However in the existing works the contradiction between energy efficiency and security of network monitoring isnpsilat well handled. In this paper, we propose SpyMon, a network monitoring mechanism for the sensor network. To achieve energy-efficiency and reliability, a subset of sensor nodes are randomly selected as monitors in the network and each sensor node is monitored by at least k nodes. For the resistance against the attacks, the monitors are protected from identity exposure to prevent them becoming the explicit targets of adversaries. A collective monitoring triggering scheme is also proposed to further improve the capability and reliability of monitoring. Our analysis shows that SpyMon is resilient against node compromise while attaining energy efficiency.