More specifically this paper explains how on. In this paper it is demonstrated how an attacker can steal a user's credentials and gain unauthorized access to such networks, by utilizing a class of vulnerable devices as MSCHAPv2 challenge response oracles. Many of today's enterprise-scale wireless networks are protected by the WPA2-Enterprise Protected Extensible Authentication Protocol (PEAP). The commands required for attacking are explained, along with the screen-shots to help understand the working. Aircrack-ng is the tool (software) that we have used to launch the attacks. We then have a look on WPA as the enhanced standard of WEP, along with some flaws in it. We begin with WEP protocol which employs a flawed RC4 algorithm is very much prone to attack and is easily crackable, then listing some of its weakness. The attacks were done in an ad-hoc network, using three laptops with wi-fi facility. We have given a brief overview of their working, structure, algorithms used and have tried to explore the real time vulnerabilities by issuing successful attacks against WEP and WPA2 network. These security mechanisms are Wired Equivalent Privacy (WEP), Wi-Fi Protected Access (WPA) and 802.11i (WPA2).Our aim is to show how an attack can be made on systems using the above mentioned mechanisms. In this study we present the security mechanisms available for WLANs. With this growing popularity, the security of wireless network is also very important. Wirelesses Local Area Networks (WLANs) have become more prevalent and are widely deployed and used in many popular places like university campuses, airports, residences, cafes etc.

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