In transmitting video data securely over Video Sensor Networks (VSNs), since\nmobile handheld devices have limited resources in terms of processor clock speed and\nbattery size, it is necessary to develop an efficient method to encrypt video data to meet the\nincreasing demand for secure connections. Selective encryption methods can reduce the\namount of computation needed while satisfying high-level security requirements. This is\nachieved by selecting an important part of the video data and encrypting it. In this paper, to\nensure format compliance and security, we propose a special encryption method for\nH.264, which encrypts only the DC/ACs of I-macroblocks and the motion vectors of\nP-macroblocks. In particular, the proposed new selective encryption method exploits the\nerror propagation property in an H.264 decoder and improves the collective performance\nby analyzing the tradeoff between the visual security level and the processing speed\ncompared to typical selective encryption methods (i.e., I-frame, P-frame encryption, and\ncombined I-/P-frame encryption). Experimental results show that the proposed\nmethod can significantly reduce the encryption workload without any significant degradation\nof visual security.
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