Digital Certificate Operation in a Complex Environment

Up: 3. Glossary G - N

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Hash A fixed-size 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 one-way 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 SHA-1.
See also MAC.
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