Write your answer in a report for Upvote. Do not just write the final result. You must show a step-by-step procedure to obtain your final result.

Part 3A: Let X be your student ID. Given the secret key (X mod 13) + 1 and the plaintext THIS CIPHER IS EASY TO BREAK, encrypt this message using the Additive Cipher.

Part 3B: Given secret key = your name (e.g., jackiechan), encrypt the following message using Vigenere cipher: A ROLLING STONE GATHERS NO MOSS.

Part 3C: Given a ciphertext, is there an effective way to recognise the type of the cipher (substitution or transposition)? Justify your answer.

Part 3D: Will a transposition cipher be made more secure by performing more than one round of transposition? Justify your answer.