However, an un-hashing algorithm would be " P" and intractable to solve - meaning that it cannot be computed in a reasonable time using standard computers.Įven though the algorithm itself is not feasibly reversible, that doesn't mean that cracking the hashes is impossible. This ties back to a fundamental mathematical problem known as the P vs NP relationshipĪbstractly, this means that the algorithm to hash the value will be " NP" and can therefore be calculated reasonably. Hashing algorithms are designed so that they only operate one way which means a calculated hash cannot be reversed using just the output given. If we were to take the word " polo" - a string of 4 characters and run it through an MD5 hashing algorithm, we end up with an output of b53759f3ce692de7aff1b5779d3964da - a standard 32 character MD5 hash. There are many popular hashing algorithms, such as MD4, MD5, SHA1 and NTLM. This masks the original value of the data and is done by running the original data through a hashing algorithm. A hash is a way of taking a piece of data of any length and representing it in another form that is a fixed length.
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