Hi,
I have made this kind of demo for a lot of Wireless hacking demo and training.
As stated in the readme file of Aircrack, Wep Cracking is not rocket science.
And, to be honest, I have not had luck each time. But could always crack it
eventually.
After lot of test (in pentest and in demo) I found that, even with the same
key, the same AP and the same PCMCIA card, downloading the same big sized file,
you get different results.
But, a good trick that seems to work, I mean that add a lot of chance to crack
WEP quickly (in a few second mostly) is to have a lot of Auth and Deauth packet
in the capture (+ associate request..)
I do it in pentest using Void11, to deauth and/or deassociate the client(s)
during the capture.
With that, i get more than 90% succes, in less than 10 minute cracking with
aircrack, Fudge Factor 2 to 8.
I use a Proxim Atheros based a/b/g card and the Auditor CD collection. (Great
tool !)
If I can't crack the WEP in 10 minutes, I consider it as lost, and redo the
capture.
Last point : I usually capture until I have collected minimum 800.000 IV. (Weak
IV aren't so common in new implementation, and not neede for the new attack.)
but have had results with only 200.000...
This is valid for 64 and 128 bit keys, in the field.
Just my 0.02â...Hoping to help.
Max
-----Original Message-----
From: Robin Wood [mailto:dninja@gmail.com]
Sent: jeudi 15 dÃcembre 2005 14:37
To: Fabien Degouet
Cc: pen-test@securityfocus.com
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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