Compare and contrast between block and stream ciphers, Computer Network Security

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Problem 1

Solve the following Caesar cipher by showing your working: EM KIUM EM AIE EM KWVYCMZML

Problem 2

Compare and contrast between block and stream ciphers, listing the relative advantages and disadvantages.

Problem 3

(a) What the 3 main steps in DES encryption?

(b) Explain how triple DES works.

Problem 4

Critically assess the given statement:

"The longer the key, the stronger the encryption." Give examples and justifications.

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