TESP2: Timed Efficient Source Privacy Preservation Scheme for Wireless Sensor Networks

Source privacy preservation against global eavesdroppers´ traffic analysis attack is one of the most challenge issues in wireless sensor networks. In this paper, we present a new timed efficient source privacy preservation (TESP²) scheme. In the TESP² scheme, each sensor node broadcasts timed data collection request to its upstream nodes, and then each upstream node will return the real data´s ciphertext if it has detected something, or a dummy data´s ciphertext if it hasn´t. After receiving ciphertexts from upstream nodes, the sensor node will filter the dummy data, re-encrypt and forward the real data´s ciphertexts to its downstream node to achieve the source privacy preservation. Security analysis and extensive simulation results demonstrate the proposed TESP² scheme can resist the traffic analysis attack and achieve high source privacy preservation with some tolerant latency.