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Another variation of Additive cipher uses a keyword instead of a single key. This cipher is called Vigenere cipher. Both variations work exactly the same. For details about Vigenere cipher, check textbook (Forouzan)

a) Encrypt the following Plaintext using Vigenere cipher: Plaintext: stocks market is falling Key : one
b) Is Vigenere cipher monoalphabetic or polyalphabetic? Why?

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