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  Data EncryptionEncryption is used to protect data from being viewed by those who are not entitled to do so. Encryption can be applied both on a system level basis (e.g. to files and directories) or at a network level (e.g. to data flowing between a Web server and a browser). We will look at encryption from the network aspect, although the principles are the same in both cases. In the case of networking, encryption is primarily being used to protect data from data snooping, in almost all modern broadcast based networks (Ethernet, Token-Ring, FDDI, etc.) it is a relatively simple matter to set-up a system which collects every single packet of data flowing on that network. These packets can then be disassembled and their contents analysed, in this way the data becomes visible to a third party.
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