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Thread: WEP not cracked after 250K packets?

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  1. #1
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    Question WEP not cracked after 250K packets?

    What am I doing wrong?

    I'm running airodump-ng and specifying my MAC, so I'm only collecting on one network. I've collected over 1.6 million beacons (although they don't help cracking) and 257,000+ data packets, but aircrack-ng in another tab isn't yet successful.

    I've also installed wepattack and it fails, too.

    What am I doing wrong?

  2. #2
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    Default Re: WEP not cracked after 250K packets?

    try increasing the "fudgefactor"

    aircrack-ng -f 4 cap01.cap

    sometimes this is the difference between cracking in 250,000 ivs and 5,000 ivs
    open source = open minds, human knowledge belongs to the world

  3. #3
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    Default Re: WEP not cracked after 250K packets?

    Quote Originally Posted by crweedon View Post
    try increasing the "fudgefactor"

    aircrack-ng -f 4 cap01.cap

    sometimes this is the difference between cracking in 250,000 ivs and 5,000 ivs
    Interesting. By the time I cracked it (~2M beacons, 350k data packets, 75k IVs) I also noticed that the number of IVs wasn't nearly as high as the number of packets. I usually have 80% of my data packets including IVs, but this time it was closer to 25%. So I guess the number of IVs was still in the "normal" range for cracking the password, but it's strange that I had to collect so many data packets to get there.

    I'll work on the -f switch, thanks for that tip. Am I right in reading that it'll take longer (trying a broader range of keys), but can often require fewer captured IVs?

  4. #4
    Senior Member kidFromBigD's Avatar
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    Default Re: WEP not cracked after 250K packets?

    Quote Originally Posted by eeepclover View Post
    Interesting. By the time I cracked it (~2M beacons, 350k data packets, 75k IVs) I also noticed that the number of IVs wasn't nearly as high as the number of packets. I usually have 80% of my data packets including IVs, but this time it was closer to 25%. So I guess the number of IVs was still in the "normal" range for cracking the password, but it's strange that I had to collect so many data packets to get there.

    I'll work on the -f switch, thanks for that tip. Am I right in reading that it'll take longer (trying a broader range of keys), but can often require fewer captured IVs?
    Yes, you read that correctly.

    But keep your eye on the ball: For purposes of cracking WEP, beacon count matters not. It's the data packets count that you require.
    Last edited by kidFromBigD; 05-10-2010 at 04:58 PM. Reason: keeping MY eye on the ball a bit better...
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    Quote Originally Posted by kidFromBigD View Post
    Yes, you read that correctly.

    But keep your eye on the ball: For purposes of cracking WEP, beacon count matters not. It's the data packets count that you require.
    I agree, beacon count is pointless, but it's the IVs in the data packets that count, right? Not just data packets.

    Quote Originally Posted by kidFromBigD View Post
    Yes, you read that correctly.

    But keep your eye on the ball: For purposes of cracking WEP, beacon count matters not. It's the data packets count that you require.
    It's really the IVs that matter, not the data packets, right? What do you see is usually the relationship between the two? I know that "most data packets have IVs", but is it 60%? 95%? What do you usually see?
    Last edited by Archangel-Amael; 05-14-2010 at 08:58 PM.

  6. #6
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    Default Re: WEP not cracked after 250K packets?

    yes it is the IV count you are looking for a very simply broken down explanation of this is wiki: initialization vector
    open source = open minds, human knowledge belongs to the world

  7. #7
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    Default Re: WEP not cracked after 250K packets?

    Are you certain you're targeting one AP? Make sure in airodump that you're only looking at the AP of choice. If not, make sure you set the MAC of the AP and the corresponding channel.

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