安全的无线传感器网络密钥预分配方案

Security key pre-distribution scheme for wireless sensor networks

密钥管理是无线传感器网络(WSN)安全的核心问题。基于二元对称多项式的随机密钥预分配方案为节点的通信提供了一种安全机制,但这些方案都存在"t-security"问题,很难抵制节点的捕获攻击。为了更好地解决该问题,提高网络的安全阈值及节点的抗捕获能力,采用可转化三元多项式代替二元对称多项式来建立节点间通信,并引入密钥分发节点进行分簇网络密钥分发。同时,由于对节点密钥采用单向Hash函数进行处理,提高了密钥破解难度。分析结果表明,该方案提高了网络的安全性及节点的抗毁性与可扩展性,降低了传感器普通节点的存储与计算开销。

Key management is the core security issue in Wireless Sensor Network （WSN）. Based on bivariate symmetric polynomials of random key pre-distribution scheme, a safety mechanism was provided for the nodes communication; however, it has the ＂t-security＂ problem and vulnerable to the node capture attack. In order to well solve this problem, and to improve the safety threshold value of network and node ability of anti-trapping, the authors used the convertible ternary polynomial instead of binary polynomial to establish inter-node communication and introduce the key distribution node to do key distribution of the cluster network. The new scheme improved the network anti-trapping ability. Moreover, decoding the sensor node key became almost impossible because of the use of the one-way Hash function. The analytical results show that this scheme has higher anti-destruction ability, scalability and security, and also reduces the overhead of storage and computation among common sensor nodes.