a. One of the challenges to computer Security is that it's often an afterthought to be incorporated into a system after the design is complete rather than being an integral part of the design process. Brief Discuss the security implication if it's an afterthought. b. As a newly employed system administrator in an IT firm, you observed that the firm has no security policy on Bring your own device and Incidence response. i. Explain the term Security policy to your boss bring to bear the need for it. ii. Briefly formulate four security policies each for bring your own device and virus infections incidence Consider a set up that corresponds between alphabetic characters as follows ABCDEFGHIJ K L M 0 1 2 3 4 5 6 7 8 9 10 11 12 N O P Q R S T U V W x Y Z 13 14 15 16 17 18 19 20 21 22 23 24 25 Assuming the encryption algorithm is C=11m+7 mod 26, where m is the message and C is the ciphertext. Encrypt the word "EXAMINATION" I. II. Derive the decryption algorithm.