Air Snort

GPL.

AirSnort can be used to recover either standard 40-bit keys or what it refers to as 128-bit keys. However, as noted in Chapter 5, the label of 128-bit WEP is a slight misnomer because it refers to the size of the RC4 key. After subtracting the 24-bit initialization vector, only 104 bits are secret. To be accurate, then, AirSnort can be used to recover 40bit secret keys and 104-bit secret keys, which correspond to the two most common WEP implementations currently on the market. Some vendors have WEP implementations that use longer keys; for example, Nokia uses 128 secret bits in addition to the 24-bit IV, and this vendor's long key-length WEP cannot currently be attacked with AirSnort. However, the longer key length doesn't provide any real protection against this attack. If the history of open source development is a guide, future versions of AirSnort will be able to attack longer keys.

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