From: Fabien Degouet (fdegouet@conthackto.com.mx)
Date: Thu Dec 15 2005 - 14:00:11 EST
Sometimes you try to crack an 802.11b/g and that's the problem.
You can capture but you will not be able to crack the wep key because you do
not capture more than the header!!. In order to attack a wireless 802.11g
you need and atheros/raling chipset and update the drivers.
Then you can set the speed and use aireplay as airodump whitout any problem.
Check the documentation of aircrack.
Once I was trying to break my wep key but my AP is B/G and I had captured
like 2 millions packets...without any result.
Hope this helps,
fabien degouet
----- Original Message -----
From: "Robin Wood" <dninja@gmail.com>
To: "Fabien Degouet" <fdegouet@conthackto.com.mx>
Cc: <pen-test@securityfocus.com>
Sent: Thursday, December 15, 2005 7:37 AM
Subject: Re: Cracking WEP and WPA keys
I'll take this one to the wireless list once I've subscribed but just
to let people know that I tried again to crack my key and failed. I
collected 1million IVs with a mix of aireplay and copying large files
between devices. Even with that I still hadn't cracked it after 521
minutes so I gave up.
I'm going to have a read of all the articles that people sent me and
if I have any more prolems I'll put them on the wireless list.
Thanks All
Robin
PS the machine doing the cracking is a Sempron 3000+ with a gig of ram
in case anyone was going to suggest the machine may not be up to it!
On 12/15/05, Fabien Degouet <fdegouet@conthackto.com.mx> wrote:
> In fact, as it is a statiscical attack, it does not depend on the "weaks
IV"
> but on the quantity.
> It's like the more unique IVs, the higher the probability to find the wep
> key quicker. Anyway, it's probability, even a 99% probability does not
> ensure you'll win!!
> In practice I used to crack 104 bit wep keys with around 500 000 packets.
If
> you're not lucky you will need more, till a million packets.
>
> While collecting packets you can run aircrack. For example you have
> collected 500 k packets, you can run aircrack on the capture file as it
> still grows (capturing with airodump), it is even faster. That's what I
> usually do.
>
>
> Fabien Degouet
>
>
> ----- Original Message -----
> From: "Eduardo Espina" <eduardomx@gmail.com>
> To: <pen-test@securityfocus.com>
> Sent: Tuesday, December 13, 2005 9:55 AM
> Subject: Cracking WEP and WPA keys
>
>
> >
> >
> > I cracked my own WEP a few months ago, I just needed to collect about
> 800,000
> > IVs with airodump, then ran aircrack and I got the key in less than one
> second.
> > (104 bit WEP) By the way, i collected the whole traffic in 2 hours.
> >
> > It doesn't just depend on the number of collected IVs, but the weak IVs
> and your
> > hardware. My frist try was using a 3Com Card, but I wasn't collecting
> enough
> > IVs, then I tried with a Prism2 Intersil card and it was done.
> >
> > You should give it more time to the airodump stage than to the aircrack
> one.
> >
> > Greetings,
> > Eduardo.
> >
> > --
> > Eduardo Espina Garcia <eespina@seguridad.unam.mx>
> > Departamento de Seguridad en Computo - UNAM-CERT DGSCA, UNAM
> > http://www.seguridad.unam.mx Tel.: 5622-8169 Fax: 5622-8043
> > GPG Key Fingerprint: "8E86 932F C364 03BE 39B8 3F9D D27E 438A 3C6A
750F"
> > "No matter how hard you try to keep your secret, it's a universal
> > law that sooner or later it will be discovered."
> >
>
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