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Hash function is a mathematical function that takes arbitrary input and maps to fixed-size value. Here’s a little example of a hash function that maps input to 4 digits number. h("dog") = 1571 h("Hey, that's a beautiful cat you've got over there!") = 9801 h("c") = 0130 Cryptographic hash function is a hash function with more restrictive properties that has many applications in cryptography, encryption and security in general. Here’s an example of modern hash function that is used in some way to ...