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IT Security and Insecurity Portal |
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Making a salted md5 hash into a regular md5? |
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Posted: Fri Jul 25, 2008 10:24 pm |
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Urb4n |
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Joined: Apr 16, 2008 |
Posts: 55 |
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is that possible in any way? I'm trying to set these hard to crack salted md5's into a cookie in order to login to a forum, thanks. |
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Posted: Fri Jul 25, 2008 11:10 pm |
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oniric |
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Joined: Jul 24, 2008 |
Posts: 65 |
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Knowing the algorithm and the hash it is theoretically possible to calculate the MD5 only of the password but that would require an impressive cpu power or very very long time.
For example if the algorithm is md5($salt.$password) calculating the "regular" md5 is exactly like cracking the salted one while instead in an algorithm such as the IPB2 one ( md5(md5($salt).md5($password)) ) one, knowing the salt, could calculate md5($salt) easily and the perform a search of the password in the md5 strings space ( 32 chars, 16 digits ): that's a huge key space!
I hope that was clear enough  |
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Re: Making a salted md5 hash into a regular md5? |
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Posted: Fri Jul 25, 2008 11:46 pm |
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waraxe |
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Joined: May 11, 2004 |
Posts: 2407 |
Location: Estonia, Tartu |
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Urb4n wrote: | is that possible in any way? I'm trying to set these hard to crack salted md5's into a cookie in order to login to a forum, thanks. |
Short answer: no  |
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Posted: Fri Jul 25, 2008 11:49 pm |
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oniric |
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Joined: Jul 24, 2008 |
Posts: 65 |
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LOL  |
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