In view of problem of low anti-capture ability of traditional key management scheme of mobile sink, namely minimum energy consumption scheme, probabilistic scheme and polynomial scheme, the paper proposed an improved key management scheme of mobile sink. The implementing principle of the scheme is as follows: all nodes share a polynomial pool F, size of polynomial loop of sensor is 1 and size of polynomial loop of mobile sink is F ; using advantage of abundant storage resources of mobile sink to ensure exist a shared polynomial in mobile sink and any sensor nearby, then to calculate shared key through the polynomial. If regulating distributed times of each polynomial are less than orders of the polynomial, it can ensure absolute security of polynomial, so as to realize the best anti-capture ability ofnodes. The experiment result showed that the scheme improves anti-capture ability and reduces energy consumption effectively of nodes comparing with probabilistic scheme.%针对传统的移动汇聚节点密钥管理方案即能耗最低方案、概率型方案、多项式方案等存在抗俘获能力低的问题,提出了一种改进的移动汇聚节点密钥管理方案.该方案实现原理:全体节点共享一个多项式池F,传感器节点的多项式环大小为1,移动汇聚节点的多项式环大小为｜F｜；利用移动汇聚节点存储资源丰富的优势保证移动汇聚节点与附近的任一传感器节点都存在一个共享多项式,进而通过该共享多项式计算出共享密钥；若规定每个多项式被分配的次数不大于多项式的阶数时,可保证多项式的绝对安全,从而实现节点抗俘获能力最优的目标.实验结果表明,与概率型方案相比,该方案有效地提高了节点的抗俘获能力,并降低了节点能耗.
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