Re: [Full-disclosure] anybody know good service for cracking md5?

[Christian Sciberras <uuf6429@xxxxxxxxx>]

Uh, in the sense that they are finally becoming *actually* useful...





On Thu, Feb 4, 2010 at 12:58 PM, Anders Klixbull <akl@xxxxxxxxxxx> wrote:

>  seems to be cropping in?
> as far as know rainbow tables has been around for years...
>
>
>
>  ------------------------------
> *From:* full-disclosure-bounces@xxxxxxxxxxxxxxxxx [mailto:
> full-disclosure-bounces@xxxxxxxxxxxxxxxxx] *On Behalf Of *Christian
> Sciberras
> *Sent:* 3. februar 2010 23:02
> *To:* Valdis.Kletnieks@xxxxxx
> *Cc:* full-disclosure@xxxxxxxxxxxxxxxxx
> *Subject:* Re: [Full-disclosure] 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@xxxxxx> 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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>

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