In the previous post, I made several assumptions about the key array that just happened to be correct, often, you will make several assumptions and find that when decrypted the plaintext looks completely wrong. If this happens go back to the last assumption you made and change it slightly. If that does not work, go back to a previous assumption. It can take a while but in the end, you will probably get the correct plaintext. This method works for cryptography in general. You can also look for words in the incorrectly decrypted ciphertext to give you a clue as to what the mistake in the key array is. We used this when we found that the last word in our incorrectly decrypted ciphertext was "AMERLCA". One of the most important skills you need to have when trying to decrpyt any ciphertext is patience.