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Re: how to decode md5_base64 encoded data to get original data

by chrestomanci (Priest)
on Jun 01, 2012 at 09:02 UTC ( #973708=note: print w/replies, xml ) Need Help??

in reply to how to decode md5_base64 encoded data to get original data

In the general case, you can't, as BrowserUK says, md5 is digest, not a cypher so you can't decrypt.

If the list of plaintexts is small and known, you could construct a lookup table that will allow you to convert from one to the other, but that is limited by the time it takes to pre-compute hashes, and the disc space to store them all. Likewise if you can guess plaintext, then you can check your guesses.

There are services online that have access to big lookup tables to decrypted hashed passwords, though they are only suitable for short common passwords, and even then don't work very well. For example I tested with the md5 hash for "password" and "secret". successfully decrypted "secret", while was not able to crack either hash.

I should also remind you that depending on the circumstances, cracking passwords in this way may be illegal, unethical, or against the rules of your employer. You should tread with caution, and seek advice before attempting to reverse any md5 hashed data or password that you did not originate yourself.

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[marioroy]: Back in HighSchool, I came late to Gym class. There was a fellow who was picked last, no team wanted him for racketball. So it was us two against everybody. I looked at him in the eye and said to let your body loose and let the powers to be help us win.
[marioroy]: We made it all the way to the end. The expience was magical. I not good at sports. Someone or thing was there.
erix considers extracting a catalog ...
[karlgoethebier]: marioroy: Racket ball is considered harmful, like Squash
[marioroy]: Wait till folks see what MCE::Hobo can do in the upcoming release. Multiple instances, nested spawning, 3 levels, doesn't matter. it works on Windiows too.
[Lady_Aleena]: I hate sites that tell me to turn ad-blocker off. They should know better.
[marioroy]: s/Windiows/ Windows/
[Discipulus]: marioroy can you expand that Niagara's fall history?
erix only sees fallen angels
erix if it weren't for bad luck, I'd have no luck at all

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