Hash Function

    A hash function is a mathematical process that takes input data of any size, performs an operation on it, and returns output data of a fixed size. A cryptographic hash function is a special class of hash function that has certain properties which make it suitable for use in cryptography. It should have five key properties:

    • The same message should always results in the same hash
    • The hash value for any given message should be computed quickly
    • It is infeasible to reverse
    • Any minor change to a message should change the hash value extensively
    • There will never be two different messages with the same hash value