Research On Key Information Security For Wireless Sensor Networks Based On Chaos Theory

At present,the research for Wireless Sensor Network has become one of the highlights in the national industry and academia,and Wireless Sensor Network is increasingly used in traffic management,health care,smart home,followed by safety issues which are increasingly prominent.Data encryption is an essential part of information security in Wireless Sensor Network(WSN).Because of WSN's own limitations,such as limited energy,limited space resources,low computing power,makes the traditional encryption algorithm not suitable for WSN.Therefore data encryption algorithm suitable for WSN becomes the basis of solving safety problems and weak link for WSN security issues.The parameter of chaotic map has high sensitivity,orbital unpredictability and pseudo randomness,closely related to cryptography.In recent years,chaotic cryptography research get a lot of achievements,providing a new way of encryption algorithm for WSN.After reading a lot of thesis about information security in WSN,the thesis mainly analyzes and improves chaotic map in data encryption,and encryption algorithm based on chaotic map is studied.The major work is shown as follow:(1)According to the characteristics of the WSN,aiming at the short period of Logistic map,the thesis proposes the method based on the initial perturbation to improve the period.The method uses Baker map to disturbance Logistic map's initial value,making each iteration initial value different.Finally,through the simulation analysis,the improved chaotic map is proved in good performance.(2)Short period of integer Logistic map is analyzed,the thesis puts forward the improved method based on the composite chaotic sequence.The integer Cubic map and linear congruence random number generator are introduced to composite the new sequence,in order to extend the sequence period,enhancing randomness.Finally,through the simulation analysis,the improved chaotic map is proved in good performance.(3)In the aspect of data encryption,the thesis studies the existing suitable for WSN encryption algorithm,and key research in view of the existing part of the classical algorithm,analyzed the advantages and disadvantages of the classical algorithm.According to the above research,this thesis proposes a suitable for WSN block encryption algorithm based on chaotic maps.The encryption algorithm uses ciphertext feedback resistance to choose plaintext attack,at the same time the shift number is large enough,so that the attacker can't come to the space using exhaustive shift digits,ensures the security of encryption algorithm.Finally according to the characteristics of WSN and suitable for WSN performance evaluation,the algorithm in security,information entropy,confusion and diffusion properties,energy consumption simulation are analyzed,showing that the algorithm has good performance,suitable for WSN.