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(a) Explain the two possible configuration for 3DES.
(b) What is the main disadvantage of 3DES?
(c) Why are most modern symmetric algorithm block ciphers?
(d) Describe four weaknesses of symmetric cryptography.
(e) Consider that Alice have to send bulk data to a remote user Bob.
Explain how Alice would use both asymmetric and symmetric cryptography to achieve both security and efficiency in terms of encryption time.
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Question: a) How many bits per second can be sent on a noiseless 4 MHz channel if four-level digital signals are used? b) If a binary signal is sent over a 3 KHz channel who
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(a) Mention the five main security services. (b) What is a passive attack? Give an example of passive attack? (c) What four types of active attacks and mention their respecti
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