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a. Encode the uppercase letters of the English alphabet as A-0, B-1, C-2 and so on. Encrypt the word BUG with the block cipher m

b.Confirm that you can decode the ciphertext using the modular inverse matrix of the block cipher matrix: 22 9 22 2 0 15 17 20

c. What does the ciphertext ONL decode to with the modular inverse matrix from Question b?

d. We use an encoded text using a Caesar cipher. The ciphertext was intercepted which is: THUBYLDH. What is the word? How did you work this out?

Encode the uppercase letters of the English alphabet as A-0, B-1, C-2 and so on. Encrypt the word BUG with the block cipher matrix 16 4 11] 10 3 2 using modulo arithmetic with modulus 26.What is the ciphertext? Show your working.
Confirm that you can decode the ciphertext using the modular inverse matrix of the block cipher matrix: 22 9 22 2 0 15 17 20 24
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Answer #1

HİJk.LMNOP は18 la 20 21 22 23 2+ 25 ル 3 C o to 3 2 16 4/ to3 2 decagpion 22. 2 2 o IS は2024 IS 2 O 2024ジG Paintezt = BUG Plaintext = BIV aes ax 자 ERyVIAE

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