Security algorithms to prevent Denial of Service ( DoS ) attacks in WLAN

This paper proposes security algorithms which are used to mitigate the Media Access Control (MAC) layer Denial of Service (DoS) attacks in WLAN infrastructure networks. This work is aimed to attend the DoS attacks due to the susceptibility of the MAC layer’s management frames. The management frames are sent unencrypted; this makes the intruder easily spoof the MAC address of the client or Access Point (AP) and stops their communication. There are two algorithms proposed in this paper namely, the Intruder Detector and Manager (IDM) and Letter Envelop Protocol with Traffic pattern filtering (LEPT). The Intruder Detector and Manager (IDM) algorithm detects and prevents the intruder entering into the network by maintaining tables in order to avoid the masquerading DoS attacks. When this procedure is followed, IDM increases the throughput by preventing intruders and maintains the history of intruders. This reduces the computational time of the AP and maintains the throughput and bandwidth. The LEPT algorithm is proposed to avoid the resource flooding DoS attacks. The experimental results prove that these algorithms effectively maintain the throughput and increase the performance of WLAN.