| 摘要:为抵抗延迟攻击，保证时间同步安全正常运行，提出WSN安全时间同步算法。算法采用梯度时间同步，同时修正时间率和本地时间，提高同步精度；采用最小二乘估计计算发送时间、时间率估计值，根据发送时间估计值和实际值偏差、时间率估计值和实际值偏差分别设置阈值检测并排除异常同步信息。仿真结果表明：算法具有同步误差小、异常检测率高的特点，且通过异常检测排除异常同步信息后同步误差降低率高，提高了同步精度和同步安全性。 |
| 关键词: 无线传感器网络 时间同步 异常检测 延迟攻击 |
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| Delay Attack-Resistant Time Synchronization for WSN |
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| Abstract:To resist delay attack and ensure time synchronization safe running, a security time synchronization algorithm for Wireless Sensor Networks is proposed. The gradient clock synchronization is adopted to improve the synchronization accuracy by correcting both the logical time rate and the local time. The least squares estimation is adopted to calculate the estimated value of the transmission time and the time rate. Based on the deviations of the estimated and actual value of the send time, and the deviations of the estimated and the actual value of the time rate, two thresholds are set respectively to detect and eliminate abnormal synchronization information. Simulation results show that the proposed algorithm can get small synchronization error and high detection rate. After eliminating abnormal synchronization by anomaly detection, the accuracy and the security of synchronization are improved. |
| Key words: Wireless Sensor Network Time Synchronization Anomaly Detection Delay Attack |