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1. (a) Consider a key space of size 378,017,167. What is the key length in bits? (b)Vigenere cipher is used with a key CAT. What

(a) Consider a key space of size 378,017,167. What is the key length in bits?

(b)Vigenere cipher is used with a key "CAT". What is the ciphertext corresponding to the plaintext, SPIRIT?

(c)Vigenere cipher is used with a key of 5 letters. What is the number of possible distinct keys?

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