What are the apects of network security?


Based on the above expectations, we can say that security involves four aspects:
·      Privacy(confidentiality)
·      Message authentication
·      Message integrity
·      Non-repudiation


Privacy means that the sender and the receiver expect confidentially. The transmitted message should make sense to only the intended receiver. To all other message should be unintelligible.


Authentication means that the receiver is sure of the sender’s identity and that an imposter has not sent the message.


Data integrity means that the data must arrive at the receiver exactly as it was sent. There must be no changes during the transmission, either accidental or malicious. As more and more monetary exchanges occur over the Internet, integrity is crucial. For example, it would be disastrous if a request for transferring $100 changes to a request for $10,000 or $100,000. The integrity of the message must be preserved in a secure communication.


Non-repudiation means that a receiver must be able to prove that a received message came from a specific sender. The sender must be able to deny sending a message that he, in fact did send. The burden of proof falls on the receiver. For example, when a customer sends a message to transfer money from one account to another, the bank must have proof that the customer actually requested this transaction.


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