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Old 03-09-2008, 06:09 AM   #16
jschiwal
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Quote:
Originally Posted by blackhole54 View Post
@H_TeXMeX_H

Thanks for the links. After anomie's observation, I guess this thread is just for "fun" now. (I thought the OP's wording of "one most important thing" sounded strange, but I guess it makes sense as an advertising slogan.) I've developed a bit of an interest in this topic as I was given a wireless "router" a while back. While I would like to try to crack my own passphrase, I am not really willing to buy the extensive dictionaries developed for that.

These articles seem consistent with what I have already read for WPA. The second article shows a screenshot where the computer running the cracking software was capable of about 140 trial passphrases/second. That works out to a little more than 10^7 per day. This is consistant with what I have read. So if the space that needed to be searched was 10^15 (for point of reference only, that's somewhat less than what you get with eight random printable ASCII characters), that would require some serious computing power to crack! So it seems to me it comes down to a sufficiently long and complex passphrase compared to the dictionaries (with search priorities) and mangling rules available. Or am I still missing something?

@jschiwal,

Actually, I said that MAC address filtering likely would not be effective.
I wouldn't suggest mac filtering by itself, but in addition. More work for an attacker to do, and it might eliminate a less adept one. Sorry I didn't remembered what you wrote correctly. I posted that message after I came back to the thread, having read it earlier. I'll edit my earlier post.

Last edited by jschiwal; 03-09-2008 at 06:12 AM.
 
Old 03-09-2008, 11:38 AM   #17
blackhole54
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Quote:
Originally Posted by H_TeXMeX_H View Post
I'm pretty sure I saw some free dictionaries somewhere, I can't seem to find the link now tho.
I know there are some free ones around. The articles you linked mentioned one or more. My impression was the really good ones cost. I'll have to mull over if I want to proceed, and if so, how.

I concur that the weak passphrases probably chosen by most people will be easily cracked. And I think 256 random bits is (at this time) uncrackable.
 
Old 03-09-2008, 12:10 PM   #18
H_TeXMeX_H
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Well, I think this says it best:

Quote:
Check out http://www.openwall.com/wordlists/ for a 'really' good one. It costs money, but its the biggest and best I've ever seen (40 Million words, no duplicates, one .txt file). There is also a free reduced version from the same site but i'm sure resourceful people can figure out where to get a good dictionary from.
http://docs.lucidinteractive.ca/inde...eless_Networks
 
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Old 03-11-2008, 05:37 AM   #19
jschiwal
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There is an old version of a published english dictionary available on the web. It's copyright expired. A dictionary purchased by a hacker probably wouldn't bother with copyright law and would also mine all sorts of mispelled words from the web as well.

I looked at an encryption howto and modified my earlier one-liner:
Code:
head -c 32 /dev/random | od -tx1 | sed '3d;s/^.\{8\}//;s/ //g' | tr -d '\n'; echo
They used uuencode to generate a random ascii character string.
 
  


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