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 PostPost subject: Decrypt this MD5 =P        Posted: Fri Dec 12, 2008 9:30 am 
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Post the decrypted message :p

I used http://www.dotcomunderground.com/web-tools/md5-encryption/ to make it


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 PostPost subject:        Posted: Fri Dec 12, 2008 9:50 am 
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You do know that any given MD5 hash can be multiple plain text messages, right? So this isn't merely something to decrypt, we also have to factor in the probabilities of different strings and their likelyhood.

In short: YOU FAIL! :P


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 PostPost subject:        Posted: Fri Dec 12, 2008 10:13 am 
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ddew wrote:
You do know that any given MD5 hash can be multiple plain text messages, right? So this isn't merely something to decrypt, we also have to factor in the probabilities of different strings and their likelyhood.

In short: YOU FAIL! :P

That was rather unnecessary, he's just posting a fun challenge...


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 PostPost subject:        Posted: Fri Dec 12, 2008 10:20 am 
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jabster wrote:
ddew wrote:
You do know that any given MD5 hash can be multiple plain text messages, right? So this isn't merely something to decrypt, we also have to factor in the probabilities of different strings and their likelyhood.

In short: YOU FAIL! :P

That was rather unnecessary, he's just posting a fun challenge...


Well the last comment was a joke, tongue in cheek and all that hence the "haha not serious" smiley. :)

As for the first bit, I figured it'd might be interesting to know that the same MD5 hash can be calculated for different strings or streams. Not everyone knows this.


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 PostPost subject:        Posted: Fri Dec 12, 2008 10:27 am 
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True, true.
Should be interesting to see who gets it though...


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 PostPost subject:        Posted: Fri Dec 12, 2008 10:54 am 
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From what I've heard it's all most impossible to get what I typed in with the encrypt thing, however if you got the same long MD5 for each passphrase entered in then it would be a great secure password generator


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 PostPost subject:        Posted: Fri Dec 12, 2008 11:03 am 
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mewrox99 wrote:
From what I've heard it's all most impossible to get what I typed in with the encrypt thing, however if you got the same long MD5 for each passphrase entered in then it would be a great secure password generator


You're pretty right about that, a dictionary brute force might come up with something if standard words and phrases were used but generally speaking it's pretty impossible to crack. As for generating passwords, using MD5 sums is an idea but there are other better alternatives depending on the level of security. Since different strings can generate the same hash it's a pretty insecure system (comparatively speaking), it's better to rely on a system where a hash can mean only one thing.


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 PostPost subject:        Posted: Fri Dec 12, 2008 11:21 am 
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mewrox99 wrote:
From what I've heard it's all most impossible to get what I typed in with the encrypt thing, however if you got the same long MD5 for each passphrase entered in then it would be a great secure password generator


You can't decrypt an MD5, it's only an hash of the data. Would take a lot of brute forcing and guessing.

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 PostPost subject:        Posted: Fri Dec 12, 2008 11:23 am 
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http://en.wikipedia.org/wiki/Rainbow_table


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 PostPost subject:        Posted: Fri Dec 12, 2008 1:43 pm 
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Challenge accepted. I'm using an MD5 brute forcer, running at 4000 hashes/sec. Lets see what plain text it comes out with. It could take a while though, brute forcing isn't the most efficient method and the time taken to brute force increases exponentially the longer the string...

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 PostPost subject:        Posted: Fri Dec 12, 2008 2:26 pm 
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I'm trying the same thing.

Not long now...

Only another...

34 hours...


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 PostPost subject:        Posted: Fri Dec 12, 2008 2:28 pm 
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WeirdEars wrote:
I'm trying the same thing.

Not long now...

Only another...

34 hours...


How can you estimate the time needed to brute force it? The string could be any length when in md5 format...

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 PostPost subject:        Posted: Fri Dec 12, 2008 2:33 pm 
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I'm using this program:

http://www.timwarriner.com/software/md5brute.html

And it says under Time Left: 00:33:47:50.

It is fluctuating quite a lot, though, so it might not be an accurate estimate. I don't even know if I'm using the right program. I don't know much about MD5s. I just googled 'MD5 brute forcer' if I'm honest.


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 PostPost subject:        Posted: Fri Dec 12, 2008 2:40 pm 
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Andy wrote:
WeirdEars wrote:
I'm trying the same thing.

Not long now...

Only another...

34 hours...


How can you estimate the time needed to brute force it? The string could be any length when in md5 format...


I thought that the MD5 hashes are always the same lenght, even if exist in 1 letter or a million.
But if they always are the same lenght, even then, it would take ages to try every combination.

If you have rainbow tables ready, only use the first 4-5 letters/numbers and start from there.

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 PostPost subject:        Posted: Fri Dec 12, 2008 11:15 pm 
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COCK. We had a power outage at 7.20 today and it lasted 55 minutes, meaning my server went offline during that time, so my MD5 brute forcing was cancelled... 5 hours of hashing for nothing! Gah.

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 PostPost subject:        Posted: Fri Dec 12, 2008 11:25 pm 
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I'm about 9 hours in on my attempt, so far nothing. I'll let you all know if it comes up with anything.


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 PostPost subject:        Posted: Sat Dec 13, 2008 12:37 am 
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Wow, it's just amazing how a MD5 hash can be created in a matter of seconds but can take days to bruteforce it...

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 PostPost subject:        Posted: Sat Dec 13, 2008 12:57 am 
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Thlump wrote:
Wow, it's just amazing how a MD5 hash can be created in a matter of seconds but can take days to bruteforce it...

Is a little mind blowing when you think of it like that, isn't it...


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 PostPost subject:        Posted: Sat Dec 13, 2008 2:25 am 
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to bad we dont have quantum computers id crack that thing really fast lol :P

it would be really weird if (about 8 hours now i guess) later the brute force method came up with nothing.


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 PostPost subject:        Posted: Sat Dec 13, 2008 8:53 am 
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you guys do realise he could have md5'ed the entire works of shakespeare, or a 2TB hard drive image? it is *extremely* unlikely that it will be cracked by a home PC in under a day bruteforcing unless it was a 5 letter word or something, but thats my point, it could be any length whatsoever.

take a look at http://en.wikipedia.org/wiki/MD5

if you want a better chance (and assuming it is a single word or something) you'd be better with:

1. dictionary attack (couple of gigs of words)
2. rainbow tables
3. give up and realise its not worth it :D


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 PostPost subject:        Posted: Sat Dec 13, 2008 8:57 am 
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Well, given the site he used, it would be a safe bet to say that its no more than a sentence...

mewrox99, its not Shakespeare is it? That would just be cruel...


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 PostPost subject:        Posted: Sat Dec 13, 2008 3:45 pm 
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zamadatix wrote:
it would be really weird if (about 8 hours now i guess) later the brute force method came up with nothing.


I've been running the bruter for 25 hours now...So far nothing...Hopefully I will have something in the next nine hours.


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 PostPost subject:        Posted: Sat Dec 13, 2008 10:28 pm 
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 PostPost subject:        Posted: Sat Dec 13, 2008 10:31 pm 
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WeirdEars wrote:
zamadatix wrote:
it would be really weird if (about 8 hours now i guess) later the brute force method came up with nothing.


I've been running the bruter for 25 hours now...So far nothing...Hopefully I will have something in the next nine hours.


any luck at the ≈7 hour mark?


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 PostPost subject:        Posted: Sun Dec 14, 2008 12:41 am 
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Nope, nothing so far. Still, it only has half an hour left. I'll let you know what if comes up with as soon as I know.


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