Which of the following BEST describes the weakness in WEP encryption?
A.
The initialization vector of WEP uses a crack-able RC4 encryption algorithm. Once
enough packets are captured an XOR operation can be performed and the asymmetric keys
can be derived.
B.
The WEP key is stored in plain text and split in portions across 224 packets of random
data. Once enough packets are sniffed the IV portion of the packets can be removed leaving
the plain text key.
C.
The WEP key has a weak MD4 hashing algorithm used. A simple rainbow table can be
used to generate key possibilities due to MD4 collisions.
D.
The WEP key is stored with a very small pool of random numbers to make the cipher text.
As the random numbers are often reused it becomes easy to derive the remaining WEP key.
The correct answer is:
A.
The initialization vector of WEP uses a crack-able RC4 encryption algorithm. Once
enough packets are captured an XOR operation can be performed and the asymmetric keys
can be derived.
Watch Professor Messer’s Video it says exactly this:
http://www.professormesser.com/security-plus/sy0-401/wireless-iv-attacks/
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Never mind, I didn’t see the asymmetric key. RC4 uses symmetric encryption.
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