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== Hashing Algorithms ==

A ''hash'' is a mathematical algorithm designed to perform ''one-way encryption''. When we say ''one-way'' we mean that once the information has been encrypted there is no way to retrieve the original information from the hashed form. Hashing is commonly used in password files and for ensuring that the integrity of data. As an example, a hash may be created for an email message in the form of a Message Authentication Code (MAC). When the message is received the receiver would also generate a hash from the message. If the recipient's hash matches the code which accompanied the message the receiver knows the mesasge is authentic and has not been tampered with during transmission.