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Dragoş Andrei Gaftoneanu
md5s CAN be reversed
7 years ago · · · Translate
Nuno Peralta · 7 years ago
I don't think they can be reversed. What you can do is to map them into known phrases. There are different phrases that can generate the same hash.
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Dragoş Andrei Gaftoneanu · 7 years ago
I didn't find any phrases that could collide if transformed to md5. I'm doing a project now, and I've found out that I can extract some really cool informations from it. So, I'm trying to figure out if I can extract the initial string from it.
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Nuno Peralta · 7 years ago
You can't, because info is lost in the algorithm. Every hash function has collisions. Think about this: how many different phrases are you write? And, how many md5 hashes can you make? Hashes are LIMITED in number, while phrases are not. Logically, there are collisions of md5 hashes for different phrases.
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Dragoş Andrei Gaftoneanu · 7 years ago
There are 22 300 745 198 530 623 141 535 718 272 648 361 505 980 416 (16^36) possibilities for md5 hashes. If you put it this way, yes, phrases collide, but, mayby you could get a string, for example if you concentrate only on a specific charset. It's just an idea.
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Nuno Peralta · 7 years ago
You can't rely on that. There is an infinite number of input strings that will generate the same output.
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md5s CAN be reversed | Dragoş Andrei Gaftoneanu | iOrbix
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