Research On Wormhole Detection Mechanism In Ad Hoc Based On Projection Pursuit

Ad hoc network is a acentric wireless peer-to-peer network, which is of covenient establishment, flexible expansibility, economy. Ad hoc is little affected by natural disasters and acidents, more and more widely applied. In the meantime, various attacks have emerged, such as wormhole attack, denial of service, black holes attack and the ash hole attack. Among them, the wormhole attack is tough to detect and has a huge destructiveness. Study on the wormhole attack behavior and formulated effective mechanism of detecting wormhole will strongly contain against the attack, improving Ad hoc network performance.In this paper, the hierarchy architecture, routing operation and maintenance mechanism of mobile Ad hoc network(MANET) is introduced firstly. Then wormhole attack aimed at specifically MANET routing protocols, especially the defensive routing protocol AODV, is discussed. According to wormhole theory and characteristics and some solutions in this field, put forward a simple and convenient wormhole detection model. Wormhole detection mechanism based on the projection pursuit (PP), which is not dependent on specific data distribution and is a wormhole detection mechanism completely based on statistics, can directly mining data correlation and introduces new ways of thinking. Genetic algorithm brought into Projection Pursuit help to optimize projection vector, and projection results can directedly help us make evaluation about node safety coefficient . And then Data collected for MANET with AODV routing protocol simulated by NS2 goes through a one-dimensional projection and second one-dimensional projection in this experiment. The tests show that a one-dimensional projection has little data loss and high rate of accuracy on wormhole detection. In the last, it was the summarization and prospect.