基于分层的传感器网络密钥预分配方案

Key predistribution scheme for sensor networks based on layering

在基于部署知识的密钥预分配方案中,随着节点部署误差的增大,网络的局部连通率将显著下降,从而导致网络的全局连通率下降。为了减轻部署误差对方案性能的影响,提出了一种新的密钥预分配模型。该模型将部署区域划分成基本区和联系区,联系区根据离基本区的远近分层,并在此基础上提出了一种新的密钥预分配方案。分析和模拟表明:与直接利用部署知识的方案相比,基于分层的密钥管理方案可以显著地提高网络的性能。

In pre-distribution scheme based on deployment knowledge, with increasing of node deployment error, local connectivity rae of network will decrease, as a result, global connectivity rate of network decreases. To reduce influence of deployment error on performances of schemes, propose a new model for key pre-distribution. This model divide deployment area into two parts：basic areas and interconnectional areas, and interconnectional areas are layered according to distance to basic areas, and a new key pre-distribution scheme is proposed on the basis of this. Analysis and simulation show that the key management scheme based on layering can significantly improve performances of networks, compared with the scheme which uses deployment knowledge directly.