How many weak packets do I need to crack WEP?

Weak Scheduling Attack:

This is a tough question, based on probability: each weak packet can reveal one certain byte of the key with a probability 5% (meaning statistically only 5 weak packets would be necessary to crack a 40-bit key). However, because the data and the initialization vector can only determine the key byte with a certain probability, the practical number of weak packets is normally 500-1000 times larger.

Note: We are currently experimenting with the weak key detection. So the number of weak keys may vary tremendously. Currently you will need about 2,000,000 data packets!

Bruteforce Attack:

The Bruteforce attack does not require any weak keys, however you will need a lot more CPU time to break a key using a bruteforce attack.

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