ASTS: An Agile Secure Time Synchronization Protocol for Wireless Sensor Networks
Time synchronization is a crucial mechanism for wireless sensor networks, so it is a natural target of the adversaries. Errors in data aggregation and failures of other mechanisms will happen as a result of imprecise time synchronization. The well-known μTESLA protocol can be employed to authenticate broadcast packets in secure time synchronization mechanisms. Unfortunately, nodes and base station should be loosely synchronized for μTESLA to function. It appears to be a dilemma that time synchronization is required to achieve time synchronization. A separate synchronization mechanism is employed in some other scheme just to escape from such a dilemma. It is shown in this paper that it is NOT necessary to assist μTESLA with any separate mechanism. Shaking off an unnecessary burden, we propose ASTS (Agile Secure Time Synchronization), a much more lightweight scheme. We build an experiment network with 32 mica2 motes to evaluate the performance of ASTS. It is shown that the synchronization error of ASTS is as low as several microseconds, matching the best possible time synchronization protocols.
Wireless sensor networks security time synchronization
YIN Xianglan QI Wangdong FU Fei
Department of Computer Engineering, PLA University of Science and Technology Nanjing, 210007 China
国际会议
上海
英文
2007-09-21（万方平台首次上网日期，不代表论文的发表时间）