KSU 2015-Summer Cyber Security | Group 1 | Seul Alice Bang

Get aWifi Password

Environment

Kali Linux1.1.0 32 bit

Aircrack-ng1.2 RC 2

What is a Aircrack-ng?

A network software that has cracker and analysis tool

for WEP, WPA/WPA2-PSK 802.11 wireless

LAN

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

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

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

Reference

[1] Crack WEP Key by using Aircrack[Online] http://blog.pages.kr/134

[2] Way to prevent wireless LAN crackingAhnlab, Aug 24, 2007, Hyunjung-Ryu[Online] http://www.ahnlab.com/kr/site/securityinfo/

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