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Sahyog Bank ran a security awareness drill for new staff. The trainer encrypted a short message by shifting every letter the same number of steps through the alphabet, then deleted the key. This trick is called a Caesar cipher.
The message is below, inside the code block. Numbers and underscores were not shifted. Only the letters moved, all by the same secret amount.
There are only 25 possible shifts, so you can try them all. This is called brute force, and it is a real technique. When one shift gives you readable English words, you have found the key.
The decoded text is the inside of a flag. Wrap it in the flag format: the letters M X C, an opening curly brace, your decoded text, and a closing curly brace. Then paste it into the Submit box. CyberChef can brute-force all 25 shifts in one click.
mcfep_qzcnp_htyd_nmd0
This challenge only. All names, addresses and data are fictional. Do not test any real system.
Stuck? Open hints in order: a nudge, then the next step, then an explicit pointer. Costs are taken from this solve's points.
Sign in to open hints.
Sign in to submit a flag.
Sign in, then solve this challenge or give up on it to read write-ups.