The WEP Algorithm

The key used for both encryption and decryption is based on a symmetric
algorithm used by WEP. The secret key is combined with an initialization vector (IV) and produces a component that is used as an input to a pseudorandom
number generator (PRGN); this results in a mathematical key
sequence linked with the message text and an integrity check value (ICV).
Essentially, you are dealing with three primary components that produce
the 802.11 data frames:


Initialization vector (IV)

Actual message text

Integrity check value (ICV)