The methods by which we communicate with each other are changing rapidly. Advances in technology have allowed us to move away from traditional paper-based media to the digital communications of the Internet, which has in turn created new challenges to the security and privacy of the data flowing over it. Envelopes and locked filing cabinets are being replaced by cryptographic security techniques such as encryption in an attempt to keep private information private. Through the use of cryptography, communications and information transmitted and stored by computers can be protected from unauthorized access. Previously, businesses carried out electronic transactions over closed networks, pre-existing contractual relationships were often in existence, and there was little doubt as to the authenticity of the sender or receiver of information.
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