Question: c) Using the Hill cipher, encrypt and decrypt the plaintext code. Show all your working. Plaintext: code 3 7 5 12 Key: a b g

c) Using the Hill cipher, encrypt and decrypt the plaintext code.

c) Using the Hill cipher, encrypt and decrypt the plaintext code. Show all your working. Plaintext: code 3 7 5 12 Key: a b g m n 0 1 2 3 4 5 6 7 8 9 10 11 12 13 op q r S t u V W Z 14 15 16 17 18 19 20 21 22 23 24 25 [10 ma d) Using the rectangular/route cipher, encrypt the following plaintext: Plaintext: attack postponed Key: 431256 6

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