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Suppose we encode a text with a Vigenere Cipher using only a single letter as a keyword. Which of the following is true? Group of

Suppose we encode a text with a Vigenere Cipher using only a single letter as a keyword. Which of the following is true?
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The result is insecure, since the encryption is equivalent to that of a Caesar Shift Cipher.
The result is fairly secure, since looking for repetitions of three-or-more characters to determine keyword length will no longer work.
The result is only as secure as an arbitrary monoalphabetic substitution cipher, since it amounts to a single randomly-ordered substitution.
The result is as secure as a monoalphabetic substitution cipher with homophones, since multiple ciphertext characters will be used to represent a single plaintext character, but not vice versa.
None of the above are true.

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