CAJ | 학술논문

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。
위저항연지공격，보증시간동보안전정상운행，제출WSN안전시간동보산법。산법채용제도시간동보，동시수정시간솔화본지시간，제고동보정도；채용최소이승고계계산발송시간、시간솔고계치，근거발송시간고계치화실제치편차、시간솔고계치화실제치편차분별설치역치검측병배제이상동보신식。방진결과표명：산법구유동보오차소、이상검측솔고적특점，차통과이상검측배제이상동보신식후동보오차강저솔고，제고료동보정도화동보안전성。
A security time synchronization algorithm is proposed to resist delay attack and ensure safe time synchronization for Wireless Sensor Networks. The gradient clock synchronization mechanism 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 estimate both the transmission time and the time rate. The abnormal synchronization information is detected and eliminated by comparing the deviation between the estimated and actual value of the send time with a threshold,and comparing the deviation of estimated and actual value of the time rate with another threshold. NS2 simulations show that the proposed algorithm has advantage with small synchronization error and high detection rate. The accuracy and the security of synchronization are improved due to the high reduction of synchronization deviation for the abnormal synchronization information being eliminated by adopting anomaly detection.