The Network Security. Org

A little theory first. WEP is a really crappy and old encryption techinque to secure a wireless connection. A 3-byte vector, called an Initalization Vector or IV, is prepended onto packets and its based on a pre-shared key that all the authenticated clients know… think of it as the network key you need to authenticate.

Well if its on (almost) every packet generated by the client or AP, then if we collect enough of them, like a few hundred thousand, we should be able to dramatically reduce the keyspace to check and brute force becomes a realistic proposition.

A couple of things will cause us some problems.

* If the key is not static, then you’ll mix up all your IVs and it’ll take forever to decrypt the key.
* Theres no traffic, therefore no packets - we can fix this.
* MAC Address Filtering - we can fix this too. Cracking WEP and WPA Wireless Networks - Docupedia

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