Research On Key Management Scheme In WSN Based On Integral Nonlinear Coupled Map Lattice Model

The Wireless Sensor Network(WSN)is a kind of intelligent network system combined with the function of information collection,information processing,information transmission.WSN is composed of large numbers of sensor nodes,which can collect the information of the deployment area in real time and transmit it to the information center or user.In recent years,WSN has been applied in many areas such as military,environmental monitoring,medical care and so on,which is constantly changing the mode of production and the way of human life.With the widespread use of WSN,people pay more attention to WSN security issues.The key management scheme of wireless sensor networks is a basic problem of WSN security.Considering the limited resources of WSN,the key management scheme in traditional network can not be directly applied to WSN.So it is necessary to design key management schemes for WSN.In the thesis,we improved the coupled map lattice model,and proposedArnold Tent Coupled map lattice.Then,by combining the nonlinear map with the integral coupled map lattice model,the Integral Nonlinear Coupled Map Lattices Model is proposed.The integer chaotic Hash function which is suitable for WSN is constructed by using the integral model.Finally,we designed a key management scheme for wireless sensor networks based on integer chaotic Hash function.The main works of this paper are summarized as follows:1.By improving CML in real field,we proposed Arnold Coupled Tent Map Lattices model(ACTML)which employs Arnold cat maps as the coupling method between lattices.Spatial lattices of Arnold Coupled Tent Map Lattices system are independent with each other,and differential distribution feature is improved.2.By improving CML in integer field and using the cat map as the lattice coupling method,the integral nonlinear coupled map lattice model was proposed.The sequences generated by the model are simulated and analyzed on the aspect of mutual information between,the distribution characteristics,and the distribution characteristics when nonlinear functions are integral Logistic map and integral Tent map.The simulation results indicate that the proposed model generates excellent pseudo-random sequences in parallel.3.A integer chaotic Hash function was designed based on integral nonlinear coupled map lattice model.And the integer chaotic Hash function is analyzed from the aspects of initial value sensitivity,confusion and diffusion properties,randomness and anti-collision.The simulation results show that the integer chaotic Hash function is safe and its structure is simple.4.Based on the integer chaotic hash function,we constructed a wireless sensor network key management scheme based on Hash function.The scheme uses the system time and integer chaotic Hash function to generate the shared key between nodes,which improves the security of system.Compared with the E-G scheme,the proposed scheme has high connectivity,strong anti-trapping ability and low energy consumption,and it is suitable for wireless sensor networks with limited resources.