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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 marks x Marks
Theory answers must be atleast lines
A Explain the four basic tasks in designing a particular security service.
OR
B Explain details of cryptography
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 User and User User owns the file File and User and User can read it User can read and write the file File which User owns, but User can only read it Only User can read and write the file File which the user owns. Assume that the owner of each of these files can execute it Create the corresponding access control matrix.
A With your own example perform Caesar Cipher algorithm
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