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The WEP key is cracked using: i) brute force attack, ii) dictionary attack, iii) FMS attack
Both i) and iii) are correct
Both i) and ii) are correct
Only iii is correct
Only i) is correct
Both ii) and iii) are correct
All 3 are correct
Traditional brute force and the Fluhrer-Mantin-Shamir (FMS) attack represent two very different styles of attack. With a brute force attack, you only need to capture a single encrypted packet and then apply an enormous amount of computing power. (You probably want two packets: one to crack the key and one to double check that the cracked key works.) FMS attacks, on the other hand, rely on capturing an enormous amount of encrypted traffic, then using very little CPU power for a probabilistic algorithm to crack the key. In fact, the FMS crack scales linearly, which means that cracking a 128-bit key takes only slightly longer to crack then a 64-bit key, once you have captured enough weak keys. Edit: I I guess this question is old school and nowadays nobody use brute force or dictionary attack to crack WEP's password. Passive packet capture to get around 50000 packets and the password may be cracked in few minutes.
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