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Author: Admin | 2025-04-28
CryptographyModern CryptographyHash FunctionHash DecoderHash CalculatorAnswers to Questions (FAQ)You can edit this FAQ section, review it or improve it!" itemscope="" itemtype="http://schema.org/Question">What is a hash function? (Definition)A hash function is an algorithm that takes data of any size as input and transforms it into a fixed-size value, called a fingerprint or hash. This transformation is unidirectional, which means that it is difficult (if not impossible) to return to the original data from the hash (which is very useful in computer science and cryptography).You can edit this FAQ section, review it or improve it!" itemscope="" itemtype="http://schema.org/Question">What is a hash? (Definition)The hash is the fingerprint result of the hash function.You can edit this FAQ section, review it or improve it!" itemscope="" itemtype="http://schema.org/Question">Why using a a hash?The hash is the fingerprint result of the hash function, it identifies with a high probability the initial data without having to store it. This allows you to verify a password, without needing to know it.Small changes in the input data lead to drastic changes in the resulting hash. This ensures data integrity and helps to check whether the data has been tampered with.You can edit this FAQ section, review it or improve it!" itemscope="" itemtype="http://schema.org/Question">How to calculate/encode a hash?The hash functions use computer data (in binary format) and apply nonlinear and non-reversible functions with a strong avalanche effect (the result is very different even if the input data is very similar). The fingerprint is usually returned as hexadecimal characters.Example: dCode has for hash MD5 e9837d47b610ee29399831f917791a44Example: dCode has for hash SHA1 15fc6eed5ed024bfb86c4130f998dde437f528eeExample: dCode has for hash SHA256 254cd63ece8595b5c503783d596803f1552e0733d02fe4080b217eadb17711ddSee the dCode pages for each hash function to know how it works in detail: MD5, SHA1, SHA256, etc.You can edit this FAQ section, review it or improve it!" itemscope="" itemtype="http://schema.org/Question">How to decrypt a hash?The principle of hashing is not to be reversible, there is no decryption algorithm, that's why it is used for storing passwords: it is stored encrypted and not unhashable.Example: 123+456=579, from 579 how to find 123 and 456? This is not possible except by trying all possible combinations.The hash functions apply millions of non-reversible operations so that the input data can not be retrieved.Hash functions are created to not be decrypted, their algorithms are public. The only way to decrypt a hash is to know the input data.You can edit this FAQ section, review it or improve it!" itemscope="" itemtype="http://schema.org/Question">What are rainbow tables?Theoretically, a brute-force mode is possible
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