Difference between Monoalphabetic Cipher and Polyalphabetic Cipher

Assignment Task

1. Explain briefly how to analyze a long ciphertext to determine whether it was the result of a monoalphabetic cipher or the result of a polyalphabetic one.

2. One-time pad Provide three reasons why the one-time pad (OTP) system is unbreakable.

3. Breaking Vigenère with a crib You are given the ciphertext below that you know to be the result of applying the Vigenère cipher with a key of no more than letters. You suspect that the crib word "quantum" occurs in the last 20 letters. Use that to break it.

4. Explain how you used or would use the crib word (“quantum”) to find at least part of the key

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