Secure and Energy-Efficient Image Transmission for Wireless Sensor Networks

Compared to full encryption approaches, selective encryption approaches are known to protect JPEG images from attacks with minimum overhead for Wireless Sensor Networks (WSNs). Since data resulting from DCT transform is correlated with each other, however, the unencrypted data in selective encryption approaches can give attackers some hint for guessing the encrypted data. In this paper, we propose away to apply full encryption to image transmission over WSNs by offloading the computational workload of sensors to a server. Based on the experimental results, we show that the proposed approach can ensure both the higher security level and the energy-efficiency at a sensor with acceptable image quality.