Question: 7) Classic cipher question - Vigenere cipher Given the following ciphertext: COGMEIKQGRDAQXNBFFGCWCVDDNDBQEVTBDVULGHIEAB Find the key that yields the following plaintext: (throw away the blanks) MR

7) Classic cipher question - Vigenere cipher Given the following ciphertext:

7) Classic cipher question - Vigenere cipher Given the following ciphertext: COGMEIKQGRDAQXNBFFGCWCVDDNDBQEVTBDVULGHIEAB Find the key that yields the following plaintext: (throw away the blanks) MR MUSTARD WITH THE CANDLESTICK IN THE HALL 8) Use the extended Euclidean algorithm, find the multiplicative inverse of: a) 1234 mod 4321 b) 550 mod 1769

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