Identical prefix attack with unicoll (a little over 1 hour on my old Core 2 Duo machine). See [link](https://github.com/CTF-STeam/ctf-writeups/tree/master/2020/ALLES!%20CTF/Doors%20of%20Durin) for details.
![Screenshot](https://github.com/CTF-STeam/ctf-writeups/raw/master/2020/ALLES!%20CTF/Doors%20of%20Durin/screenshot.png)