![]() ![]() If you have the hashed version of a password and you know the hashing algorithm, you can use that hashing algorithm to hash a large number of words - a dictionary. 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. The problem for crackers was that they were hashed using bcrypt and all but a fraction of them were too strong to break in any kind of reasonable time frame.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. If you remember a few years ago there was a breach of the Ashley Madison website and 36 million password hashes were leaked. Unlike the other hash algorithms we’ve encountered so far bcrypt is specifically designed to be slow to crack, especially for GPUs, and you can see that reflected very poignantly in the screenshot below. John -format=bcrypt -wordlist=/usr/share/wordlists/rockyou.txt hash1_4.txt Hashcat -m 3200 hash1_4.txt /usr/share/wordlists/rockyou.txt ![]()
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February 2023
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