Analysis And Improvement Of Security Technology In WLAN

With the rapid growth of WLAN, the WLAN has got widely deployed in many fields, even in military. At the same time, the quick development of WLAN has brought about more security requirements in WLAN. Most WLAN based on 802.11 standard adopt WEP as security mechanism to provide data security in WLAN. For lack of taking the security problems into consideration at the time when WEP was designed, some security flaws are left behind in WEP. The development of WLAN urges the exposure of the security flaws, resulting in WEP cannot meet the requirement. Base on the analysis of main security problems of WEP, this paper presents a solution to security problems in WLAN.In the paper, the analysis of security characters and security requirement of WLAN is made at first. Then we will discuss the five main security flaws existing in WEP including the encrypting mechanism of WEP, message authentication code, key management, IV reuse, and authentication. The emphasis of the paper is to present a solution to security problems in WLAN, which is based on the fundamental topological structure of Infrastructure. The design includes four main modules: data encryption, data integrality code, key management and authentication. To ensure data security of WLAN, the design adopts Rijndael algorithm's implementation in OCB mode to provide authenticated encryption, presents a double dynamic key management mechanism, and adopt mutual authentication based on public key system. Primary performance analysis of the design is made at the end.