Hashing   is a method of one-way encryption which is ideal for storing passwords in a database, as you may never require a decrypted version.

To authenticate some data, simply hash what the user input and compare it with the data stored in the database A hash code will always be a small fixed size irrespective of the  data length of the source.

This makes hashing ideal for comparing files or identifying errors in a data stream (similar to a checksum)A single-bit alteration in any part of  the source...
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