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Unformatted text preview: 2. In this problem you will use a modified ECB cipher. Instead of encrypting 64 bits at a time, encrypt a fixed length of characters at a time using Hill cipher. Find the cipher text using the given Hill cipher key and plaintext. Hint: Convert each character to a number between 0 and 25, as in Hill cipher. The fixed length is determined by Hill cipher key. a) = 3 19 8 7 K , Plaintext = “FIRSTEXAMX” b) = 19 21 5 2 18 17 2 21 17 K , Plaintext = “INTHISCOURSE” 3. Do problem 2 again with a modified Cipher Block Chaining Mode. Instead of XOR the plaintext block with the previous cipher text block, add them up character by character and then mod by 26. Hint: (11, 12) + (21, 22) = (11+21, 12+22) = (32, 34) = (6, 8)...
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 Spring '07
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 Cryptography, Encryption, cipher text, Hill cipher key

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