Once upon a time, silvioprog said: > 2013/12/11 Ewald <ew...@yellowcouch.org <mailto:ew...@yellowcouch.org>> > > Go to: http://md5decryption.com <http://md5decryption.com/> > In "Please input the MD5 hash that you would like to be decrypted:" > field, put: 7db4a8dae498d1b4686ebd1f79326602 > See the result in "Decrypted Text:" field. Yes, I've seen the site, what they probably do is a reverse lookup in a table, but it cannot be called `decryption`. Encryption is two way: an output can be converted back to the original input. This is not the case with a hashing function. Take for example a very simple function that xor's all input bytes together (with MD5 it boils down to the same, albeit a bit more complex). If I give you the output $F0, how do you know what was the original input? The answer is you don't. It could be [$80 $70] as well as it could have been [$C0 $FF $30 $FF]...
While both algorithm types (encryption and hashing) are related (the above xor example classified as a checksum, whereas xor encryption also exists), they are definitly not the same. -- Ewald
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