Decrypting Caesar's Cipher?

With the simplicity of Caesar's Cipher, I think we can make educated guesses on what a ciphertext translates to (while not knowing the key), given that:

  • The message is a meaningful sentence in a language we know
  • The message is, for the most part, grammatically correct
  • The message uses common words
  • ...and that the key is consistent for all letters.

As such, try decrypting the next few statements.

Oh, and we only consider messages consisting of uppercase letters and spaces.

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What's Caesar's Cipher?

Caesar's Cipher is a symmetric-key cryptosystem named after Julius Caesar. The idea is that all characters in the plaintext (in this case, the message you are guessing) are shifted by k number of keys to get a new character.

For example: 'A' shifted by 3 keys becomes 'D'. Shifted by 28 keys and it becomes 'B'.