How do I find out if its 64 or 128?

[Whitecrow]

I cant figure out where to find if the connection is a 64 WEP or a 128 WEP, when I search networks it just tells me "WEP" or "WPA" or "OPN"

My question is, when it comes down to using aircrack and actually cracking the WEP code, how do i know what do put after the "-n" like how am i suppose to know if its "-n 64" or "-n 128" how do i find that out??

Also I dont think Kismet works on my computer, whenever I tried typing kismet in, nothing ever popped up, one time it gave me a weird error, but i think it was cause i had airodump open.

I'm using Back Track 2, on a USB start up.

Thanks in advance!

[imported_=Tron=]

Well this is something that you should easily know since you have typed in the WEP key on your router yourself, right?

[Archangel-Amael]

Also I dont think Kismet works on my computer, whenever I tried typing kismet in, nothing ever popped up, one time it gave me a weird error, but i think it was cause i had airodump open.

Did you ever edit the kismet.conf file? As for how to do this check here:
http://www.kismetwireless.net/documentation.shtml

[carrot]

Well this is something that you should easily know since you have typed in the WEP key on your router yourself, right?

Well you never know, he might have forgotten it.

In case you had a sudden random bout of forgetfulness and forgot whether YOU set YOUR router to 64 bit or 128 bit....
It actually doesn't matter. At least not for me. I just type in

aircrack-ng -b BSSID file where packets are

And it works every time.

[imported_=Tron=]

In case you had a sudden random bout of forgetfulness and forgot whether YOU set YOUR router to 64 bit or 128 bit....
It actually doesn't matter. At least not for me. I just type in
Code:

aircrack-ng -b BSSID file where packets are

And it works every time.

That is because aircrack-ng, when the key length is left unspecified, will test 1000 64 bit keys before beginning with the default 128 bit cracking.

[Whitecrow]

Tron, yes its my router, yes I know its a 128 WEP encrypted, but I was just curious on how you would go about seeing that information, I'm new to all this so I'm just trying to learn little stuff that might help later. Thanks for all the info though! Oh and no I did not edit my Kismet config file, and thats the error it gives me, I'll check out that link Archangel posted, thanks for it.

[imported_=Tron=]

Tron, yes its my router, yes I know its a 128 WEP encrypted, but I was just curious on how you would go about seeing that information...

There really is no other way to figure out the key's length than trial and error in case you do not know it.