Express Learning: Cryptography and Network Security

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Overview of Network Security

1. What is the need for network security? Explain its goals.

Ans.: During the last two decades, computer networks have revolutionized the use of information. Information is now distributed over the network. Authorized users can use computer networks for sending and receiving information from a distance. People can also perform various tasks such as shopping, bill payments and banking over a computer network. This implies that the computer networks are nowadays used for carrying personal as well as financial data. Thus, it becomes important to secure the network, so that unauthorized people cannot access such sensitive information.

For secure communication, there are some basic goals of network security that ...