Digital Certificate Operation in a Complex Environment 
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Hash 
A fixedsize result obtained by applying a mathematical
function
(the hashing algorithm) to the data supplied (possibly a
password or a longer message). Usually, a
hash value will be much shorter than the original data.
Most importantly, a hash is a oneway function. It is considered to be impossible (currently) to compute the original data (back) from the hash. Thus, a hash may also known as a 'message digest'). Typical hashing algorithms include MD2, MD4, MD5, and SHA1. See also MAC. 