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Question 4. (0.5 marks) a. Decrypt the following message: HS CSYV FIWX. The message was encrypted using Caesar cipher, shifting four letters to the right.

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Question 4. (0.5 marks) a. Decrypt the following message: HS CSYV FIWX. The message was encrypted using Caesar cipher, shifting four letters to the right. b. Using the transposition cipher technique, decrypt the message BCDEA@T@@EHTKTHIS@T@YEOA The text is encrypted using a grid of 4 by 6 by spiraling inward from the top right of the grid moving clockwise

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