Cryptography and Network Security
Network security deals with the problems of legitimate messages being captured and replayed. Network security is the effort to create a secure computing platform. The action in question can be reduced to operations of access, modification and Deletion. Many people pay great amounts of lip service to security but do not want to be bothered with it when it gets in their way. It's important to build systems and networks in such a way that the user is not constantly reminded of the security system. Users who find security policies and systems to restrictive will find ways around them.