1. KSU 2015-Summer Cyber Security | Group 1 | Seul Alice Bang Get a Wifi Password

2. Environment Kali Linux 1.1.0 32 bit Aircrack-ng 1.2 RC 2

3. What is a Aircrack-ng? A network software that has cracker and analysis tool for WEP, WPA/WPA2-PSK 802.11 wireless LAN

4. How to get a WEP password? Activate interface what we use. Change mode to ‘monitor’ of wireless LAN card. Step 1.Interface Setting It finds reachable APs. It shows ssid, bssid, channel that AP uses. Step 2.Find WLAN To send packets, get connect with target AP by fake identifying Step 3.Fake Identification

5. How to get a WEP password? According to option what we assign, we can collect wireless packets what we want. Step 4.Capture Packets If there are no traffics, we aren’t able to capture packets so we send packets continuously. Step 5.Injection Attacking With collected packets, we can crack WEP. Step 6.Crack WEP

6. How to Defense? 1 Lower the intensity of the signal 2 Set a MAC address, block access to devise that isn’t registered 3 Deactivate broadcasting of SSID 4 Use WPA than WEP WLAN security tips By Prof. Michel Cukier at University of Maryland

7. Reference [1] Crack WEP Key by using Aircrack [Online] http://blog.pages.kr/134 [2] Way to prevent wireless LAN cracking Ahnlab, Aug 24, 2007, Hyunjung-Ryu [Online] http://www.ahnlab.com/kr/site/securityinfo/ secunews/secuNewsView.do?seq=10525