CAJ | 학술논문

针对无线Mesh网络的安全问题，提出一种改进的信任模型ESTrust。利用观测节点和待评价节点在若干时间片内的交互次数构造时间序列，通过三次指数平滑法预测下一个时间片两节点的交互次数，取预测值和实际交互次数的相对差值比计算待评价节点的直接信任值。引入熵值法为网络中各观测节点对待评价节点的直接信任值分配加权系数，并对这些直接信任值进行加权运算，得到待评价节点的综合信任值。仿真结果表明：当网络存在恶意节点时，相比AODV路由协议和Beth信任模型，ESTrust模型拥有更好的服务质量和更低的通信代价。
침대무선Mesh망락적안전문제，제출일충개진적신임모형ESTrust。이용관측절점화대평개절점재약간시간편내적교호차수구조시간서렬，통과삼차지수평활법예측하일개시간편량절점적교호차수，취예측치화실제교호차수적상대차치비계산대평개절점적직접신임치。인입적치법위망락중각관측절점대대평개절점적직접신임치분배가권계수，병대저사직접신임치진행가권운산，득도대평개절점적종합신임치。방진결과표명：당망락존재악의절점시，상비AODV로유협의화Beth신임모형，ESTrust모형옹유경호적복무질량화경저적통신대개。
Aiming at the security problem of WMN,we propose an improved trust model ESTrust.It uses the number of interactions between observation node and evaluating node within several time periods to construct the time series,and predicts the number of interactions between the two nodes within next time period through cubic exponential smoothing method.The relative difference ratio of the predicted and actual number of interactions is used to calculate the direct trust value of the evaluating node.It introduces the entropy method to allocate the weight coefficients on the direct trust values of the evaluating node for every observation node in network,and conducts weighting operations on these direct trust values to get the synthesised trust value of evaluating node.Simulation results show that compared with AODV routing protocol and Beth trust model,the presented ESTrust model has better service quality and lower communication cost when there are malicious nodes in WMN.