One-Way-Hash

A hash-function calculates a value of a given length, from any input (e.g. password or file).

• A hash-function is designed to be a one way function, therefore it is not possible to recover the original input from the calculated value.
• Different inputs can lead to the same calculated value (collision). Good hash functions generate few collisions.
• Similar passwords will not result in similar hash values, so you can make no conclusions about the affinity of two passwords.

Example:

Peter Piper picked a peck of pickled pepper