Question: Q4 answer all questions (a) What is the difference between confidentiality and authentication? (b) A cipher system uses the same set of key for encryption

Q4 answer all questions

(a) What is the difference between confidentiality and authentication?

(b) A cipher system uses the same set of key for encryption and decryption. Is this a symmetric cipher or asymmetric cipher? Explain the reason.

(c) Explain how a frequency hopping spread spectrum system is used to provide security over a transmission channel.

(d) A direct sequence spread spectrum system is used to provide security over a transmission channel. Explain the function of the spreading code.

(e) The normal headphone and microphone are analog in nature. To use the computer for voice over IP (VOIP), the signal has to be sampled and then converted to discrete time. W hat is the sampling frequency used and why is this value chosen?

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