Improvement On Wireless LAN Encryption Based On Chaotic Cryptography Protocol

LAN can be seen everywhere, has become a part of our lives, but the wireless network security space is still clouded.2013’s "Prism" incident has lasted more than a year of fermentation, which shocked the people began to attach importance to the safety of the individual networks. The second generation of wireless LAN data confidentiality agreement is used WiFi Protected Access (WPA), using AES algorithm as the high data encryption standard for wireless LAN protocol. At present, people have found some loopholes WPA.Chaos Cryptography its sensitivity to initial conditions, long-term unpredictability and good pseudo-random properties, the rapid development of network security applications. These chaotic systems has good characteristics but coincided with secure communication and cryptography highly consistent with the basic requirements, chaotic model unique sensitivity to initial conditions and the unpredictable nature just to meet the long-term proliferation and confusion password system design principles. Therefore, this paper will use the chaos theory knowledge to continue to improve and perfect WPA/WPA2 agreement to these security risks in the bud stage.Due to the wireless LAN is using a wireless transmission, easy to intercept and monitor, and the attack on the wireless local area network (LAN) is mainly concentrated in the WPA and AES algorithm is adopted in the agreement. In this thesis using chaos theory of the Logistic model of AES encryption algorithm is improved, thereby to enhance the security of the WPA agreement. The main work of this paper includes:(1)aiming at key extension module in AES algorithm of two deficiencies, this paper adopts the method of changing the initial value of chaotic systems, the value of each iteration as sub-key of each round, thus reducing the linear correlation between the wheel key, also is eliminated from the threat of a key that all key space.(2) in view of the initial key of the AES algorithm is fixed in advance, can from then on, the reasoning of subsequent key part, this thesis USES chaotic systems with good pseudo random characteristics, and have high sensitivity to initial values, the data flow of discrete chaotic systems into the initial key of AES algorithm, so that security and randomness of initial key greater security, at the same time also strengthened the complexity of the encryption algorithm.(3) using chaos theory, the improved AES algorithm associated test experiment was carried out in the wireless local area network (LAN), in the key space, the respect such as randomization, efficiency and sensitivity with the original AES algorithm is analyzed and compared, and try to do for the future wireless network security.With the advent of big data, cloud computing and networking, and application of wireless networks will accelerate the development of high-standard wireless network security is imminent, based on the good characteristics of chaotic wireless network password and will certainly bear fruit for our lives escort, to lay the foundation for the implementation of things.