full-disclosure - Re: anybody know good service for cracking md5?

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Date: Wed, 3 Feb 2010 23:02:20 +0100
From: Christian Sciberras <uuf6429@...il.com>
To: Valdis.Kletnieks@...edu
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: anybody know good service for cracking md5?

Actually dictionary attacks seem to work quite well, especially for common
users which typically use dictionary and/or well known passwords (such as
the infamous "password").
Another idea which seems to be cropping in, is the use of hash tables with a
list of known passwords rather then dictionary approach.
Personally, the hash table one is quite successful, consider that it targets
password groups rather than a load of wild guesses.

Cheers.

On Wed, Feb 3, 2010 at 10:26 PM, <Valdis.Kletnieks@...edu> wrote:

> On Wed, 03 Feb 2010 23:42:07 +0300, Alex said:
>
> > i find some sites which says that they can brute md5 hashes and WPA dumps
> > for 1 or 2 days.
>
> Given enough hardware and a specified md5 hash, one could at least
> hypothetically find an input text that generated that hash.  However, that
> may or may not be as useful as one thinks, as you wouldn't have control
> over
> what the text actually *was*.  It would suck if you were trying to crack
> a password, and got the one that was only 14 binary bytes long rather than
> the one that was 45 printable characters long. ;)
>
> Having said that, it would take one heck of a botnet to brute-force an MD5
> has
> in 1 or 2 days. Given 1 billion keys/second, a true brute force of MD5
> would
> take on the order of 10**22 years.  If all 140 million zombied computers on
> the
> internet were trying 1 billion keys per second, that drops it down to
> 10**16
> years or so - or about 10,000 times the universe has been around already.
>
> I suspect they're actually doing a dictionary attack, which has a good
> chance
> of succeeding in a day or two.
>
>
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