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Cryptographic hash functions are an important tool in cryptography to achieve certain security goals such as authenticity, digital signatures, digital time stamping, and entity authentication. They are also strongly related to other important cryptographic tools such as block ciphers and pseudorandom functions. This paper aims to overview the cryptographic hash functions and its strength against attacks. Hash functions are functions that compress an input of arbitrary length to a result with a fixed length. If hash functions satisfy additional requirements, they are a very powerful tool in the design of techniques to protect the authenticity of information.
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