Part C

Each question carries $8$ marks $-3$x$8=24$ Marks Theory answers must be atleast $16$ lines

$17$ A$.$ Explain in details, why we need security policy and explain components of security policy

OR

B$.$ Explain any $6$ categories of security mechanism

$18$ A$.$ Perform Playfair cryptography for the following:

Message: I am in Muscat Oman

Keyword: TOYOTA

OR

B$.$ Statement: "Hash functions are a crucial component of cryptography". Support the statement with your answer, your answ must have the answer for why and how.

$19$ A$.$ Perform S$-$Box for the bits: $0110000100010111101110101000100110010100100111$

$\backslash$table$[[\backslash$table$[[$Row$],[$number$]],$Column Number$],[0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15],[0,14,4,$is$,1,2,15,$II$,8,3,10,6,12,5,9,0,7],[1,0,15,7,4,14,2,13,1,10,6,12,11,9,5,3,8],[2,4,1,14,8,13,6,2,11,15,12,9,7,3,10,5,0],[3,15,12,8,2,4,9,1,7,5,11,3,14,10,0,6,13]]$

OR

B$.$ Demonstrate the steps involved in AES algorithm