Not all nuts are identical. One nut on the piece marked "U&U" is a standard nut, while the other three have a shaved, flat side . Initial Setup:
Perform a strings command or use a hex editor to look for hidden keys or base64 strings. UUUUUU.rar
Align the flat edges of the irregular nuts so they face each other. Not all nuts are identical
Use the of the Hanayama bolt to slide past the U&U bolt at a specific angle. Align the flat edges of the irregular nuts
Check if the file is a valid archive. Common CTF tropes involve corrupted headers (e.g., changing "Cat!" back to "Rar!") or password-protected archives that require cracking via John the Ripper .
The challenge involves two interlocking U-shaped bolts with nuts on the ends that can be screwed but not removed.
Spin the right-side nut (with the flat edge) nearly to the top, ensuring the flat side faces inward.