Question: Q5. (a) Define cryptography with diagram. [5 Marks] (b) The simplest mono alphabetic cipher is probably the shift cipher. i) Use the shift cipher with

Q5. (a) Define cryptography with diagram. [5 Marks] (b) The simplest mono alphabetic cipher is probably the shift cipher. i) Use the shift cipher with key = 15 to encrypt the message "WELCOME." [5 marks) ii) Use the shift cipher with key = 15 to decrypt the message "WTAAD

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