Secure hash functions
A secure hash function will generate a large number, called the hash value, when given a document of some sort. This document can be of almost any type. We will be using simple strings in our examples.
The function is a one-way hash function, which means that it is effectively impossible to recreate the document when given a hash value. When used in conjunction with asymmetric keys, it allows the transmission of a document with the guarantee that the document has not been altered.
The sender of a document will use a secure hash function to generate the hash value for a document. The sender will encrypt this hash value with their private key. The document and the key are then combined and sent to a receiver. The document is ...
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