A hash function is a mathematical function for turning data into a fixed-length number which can be used for a variety of purposes.

 

String to hash:
Salt can be used with hashed strings to make a Rainbow Table attack probably impossible. If used, the salt should be memorable and secret. The default is a human-readable random password.
Optional salt:

 

This page generates a standard, 32-character hash, a more secure 40-character hash and a 32-bit cyclic redundancy integer. It also allows you to specify a salt for the original string, thus extending it and making it much more secure.