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A weakness in WEP which makes it vulnerable to a cryptographic attack is which of the following?
The manner in which it uses initialization vectors
Allowing the user to input a random key
The manner in which it creates initialization vectors
Weak key generation algorithm
WEP uses RC4 to encrypt packets. Prior to encryption, it appends the initialization vector onto the key. The resulting bit string is then fed into the RC4 algorithm. As the initialization vector is also transmitted clearly, that means that the attacker knows the first three bytes of a secret key, and can use that as the basis for discovering the rest of the (short) key. Weak key generation is a problem with WEP, but one that makes it vulnerable to dictionary attacks, not cryptographic attacks. The creation of initialization vectors is also a problem with WEP, and although it makes some keys weaker than others, it's not the primary vulnerability. Allowing the user to input a random key actually provides strength over using the AP's key generation from a user provided passphrase.
Edit: use IV with the PSK is a weak key generation algorithm. I can't see why weak key algorithm is related to dictionary attack. If the IV is 48 bit in length, the attack would be much more difficult. The options provided are relatively ambiguous and the way using the IV and the weak key generation algorithm are interrelated. Use check boxes may be a better choice for this question.
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