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Part B Each question carries 5 marks - 4 x 5 = 2 0 Marks Theory answers must be atleast 1 0 lines 1 3

Part B
Each question carries 5 marks -4x5=20 Marks
Theory answers must be atleast 10 lines
13 A. Explain the four basic tasks in designing a particular security service.
OR
B. Explain details of cryptography
14 A. Consider a computer system with three users: Alice, Bob, and Cyndy. Alice owns the file alicerc, and Bob and Cyndy can read it. Cyndy can read and write the file bobrc, which Bob owns, but Alice can only read it. Only Cyndy can read and write the file cyndyrc, which she owns. Assume that the owner of each of these files can execute it.
i. Create the corresponding access control matrix.
ii. Cyndy gives Alice permission to write cyndyrc, and Alice removes Bob's ability to read alicerc. Show the new access control matrix.
OR
B. Consider a registration system with three users: User 1, User2, and User3. User3 owns the file File3, and User1 and User2 can read it. User2 can read and write the file File 1, which User1 owns, but User3 can only read it. Only User 1 can read and write the file File2, which the user 2 owns. Assume that the owner of each of these files can execute it. Create the corresponding access control matrix.
5 A. With your own example perform Caesar Cipher algorithm
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