Network security is concerned with making sure that no unauthorized people cannot read, modify messages intended for other recipients. Network security problems can be divided roughly into four intertwined areas: Secrecy has to be with keeping information out of the hands of unauthorized users. Authentication deals with determining whom you are talking before revealing sensitive information or entering into a business deal. Non repudiation deals with signatures Integrity control tells how can you be sure that a message you received was really the one sent and not something that a malicious adversary modified in transit . Secrecy and integrity are achieved by using registered mail and locking documents up, none of them solve the authentication or non-repudiation problem in a sufficiently general way.
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