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In cryptography, an [initialization] vector (IV) is a block of bits that is required to allow a stream cipher or a block cipher to be executed in any of several streaming modes of operation to produce a unique stream [independent] from other streams produced by the same encryption key, without having to go through a (usually lengthy) re-keying process. IV's are commonly referred to in wireless network hacking, more specifically WEP hacking, where a hacker fakes [association] with a wireless access point and generates IV's that are used to crack the WEP key of the network.
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