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So I looked at an MD5 hash and...

 
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Fafaffy
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PostPosted: Sat Jun 16, 2012 8:28 am    Post subject: So I looked at an MD5 hash and... Reply with quote

I thought, since a it's always 32 characters long, doesn't that mean their's a million passwords that'll work for any given hash? I thought since the MD5 only contained letters and numbers, if you make every possible 32-character long combination, you can get a valid password for any MD5 hash, no matter how salted it is.

Anyway, these numbers surprised me:

26 letters
10 numbers
32 length

So, 26 + 10 = a total of 36 letters 1 character can be

32 is the length, so 36^32 gives us how many combination an MD5 hash could be.

Well, I did it, and the result was:
63,340,186,662,973,227,706,162,286,946,811,886,609,896,461,828,096

Honestly, I don't even know how to say that number, but I didn't think a 32 character long hash can give that many results ;_;

But what if someone (like a russian) made every single 32 character combination? They could crack every hash easily as hell.

Anyway, I'm just rambling off random shit I thought of, which is why it belongs in random spam :3

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Butters
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PostPosted: Sat Jun 16, 2012 8:42 am    Post subject: Reply with quote

id like to see you try and generate 63,340,186,662,973,227,706,162,286,946,811,886,609,896,461,828,096 combinations
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Barnold Swolezzenegger
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PostPosted: Sat Jun 16, 2012 8:49 am    Post subject: Reply with quote

Even if you could, it'd take so many years it wouldn't even be funny. Assume it takes 5ms per combination to be sent, it would take years upon years upon years to get it.
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Kriogenic
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PostPosted: Sat Jun 16, 2012 10:44 am    Post subject: Reply with quote

haha that is a damn lot of combinations... even going as fast as one hash per ms it would take 1.9x10^40
roughly
20,000,000,000,000,000,000,000,000,000,000,000,000,000 years O.o
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Slugsnack
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PostPosted: Sat Jun 16, 2012 11:01 am    Post subject: Reply with quote

this is called hash collision and in fact md5 is not collision resistant and has collision vulnerabilities:
http://en.wikipedia.org/wiki/MD5#Collision_vulnerabilities

you should try to read some of those papers though and you'll realise it is not trivial to even follow the workings of some of the guys that came up with those techniques
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the the the
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PostPosted: Sat Jun 16, 2012 5:33 pm    Post subject: Reply with quote

Slugsnack wrote:
this is called hash collision and in fact md5 is not collision resistant and has collision vulnerabilities:
http://en.wikipedia.org/wiki/MD5#Collision_vulnerabilities

you should try to read some of those papers though and you'll realise it is not trivial to even follow the workings of some of the guys that came up with those techniques
yeah really

also another question people wonder is whether there is a hash that when hashed produces itself

so d6aa97d33d459ea3670056e737c99a3d -> d6aa97d33d459ea3670056e737c99a3d when hashed (although that is not the right one obviously)
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