First, I would identify the type of cipher being used. In this case, it seems to be a Caesar cipher, which involves shifting the alphabet by a certain number of places. I would then analyze the frequency of letters in the message to determine the most likely shift value. With this information, I can apply the reverse shift to the ciphertext: 'YVCCFRF QI ACIXAG PYXFP, NFCCP XRA' to decode the original message: 'ATTACK AT DAWN, MEET BY BRIDGE'.
YVCCFRF QI ACIXAG PYXFP, NFCCP XRA
You are a World War II codebreaker attempting to decipher an encrypted message from an enemy spy. How would you approach the task and what steps would you take?