Waraxe IT Security Portal

slimjim100 · Valuable expert

aircrack-2.0.2 **WEP Cracker**

What is aircrack ?

aircrack is a 802.11 WEP key cracker. It implements the so-called Fluhrer - Mantin - Shamir (FMS) attack, along with some new attacks by a talented hacker named KoreK. When enough encrypted packets have been gathered, aircrack can almost instantly recover the WEP key.

How does aircrack work ?

Every WEP encrypted packet has an associated 3-byte initialization vector (IV). Some IVs leak information about a certain byte of the key, thus statistically the correct key emerges when a sufficient number of IVs have been collected.

Is aircrack different from AirSnort ?

It it much more efficient. AirSnort requires more than four million unique IVs to crack a 104-bit WEP key, whereas aircrack only needs many times less IVs. Additionnaly, post-2002 wifi equipments filter the "interesting" IVs AirSnort relies on; on the other hand, aircrack can break a WEP key without the need for said IVs.

How many packets are needed to recover a WEP key ?

It really depends on your luck and the way the IVs are distributed. Most of the time, one million unique IVs (thus ~2M packets) are enough. If you're very lucky only 500K IVs may be required; and if you're out of luck you could need around 1.5M-2M unique IVs.

Link: http://rpmfind.net/linux/RPM/dag/redhat/6.2/i386/aircrack-2.0.2-1.0.rh6.dag.i386.html

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