How many IVs are required to crack WEP ?
WEP cracking is not an exact science. The number of required IVs depends on the WEP key length, and it also depends on your luck. Usually, 40-bit WEP (64 bit key) can be cracked with 300,000 IVs, and 104-bit WEP (128 bit key) can be cracked with 1,500,000 IVs; if you’re out of luck you may need two million IVs, or more. There’s no way to know the WEP key length: this information is kept hidden and never announced, either in management or data packets; as a consequence, airodump-ng can not report the WEP key length. Thus, it is recommended to run aircrack-ng twice: when you have 250,000 IVs, start aircrack-ng with “-n 64” to crack 40-bit WEP. Then if the key isn’t found, restart aircrack-ng (without the -n option) to crack 104-bit WEP. With the introduction of the PTW technique in aircrack-ng 0.9, the number of data packets required to crack WEP is dramatically lowered. Using this technique, 40-bit WEP (64 bit key) can be cracked with as few as 20,000 data packets and 104-bit WEP (128 b
WEP cracking is not an exact science. The number of required IVs depends on the WEP key length, and it also depends on your luck. Usually, 40-bit WEP (64 bit key) can be cracked with 300,000 IVs, and 104-bit WEP (128 bit key) can be cracked with 1,500,000 IVs; if you’re out of luck you may need two million IVs, or more. There’s no way to know the WEP key length: this information is kept hidden and never announced, either in management or data packets; as a consequence, airodump-ng can not report the WEP key length. Thus, it is recommended to run aircrack-ng twice: when you have 250,000 IVs, start aircrack-ng with “-n 64” to crack 40-bit WEP. Then if the key isn’t found, restart aircrack-ng (without the -n option) to crack 104-bit WEP. With the introduction of the PTW technique in aircrack-ng 0.9, the number of data packets required to crack WEP is dramatically lowered. Using this technique, 40-bit WEP (64 bit key) can be cracked with as few as 20,000 data packets and 104-bit WEP (128 b
