I figured out cout eventually, and went ahead and started a bruteforce solver. After some calculations, I decided it would take at least 10^34 years to test all possible keys, so I gave up.
OS: Windows 10 64 bit Professional
CPU: AMD Ryzen 5900X
RAM: 48GB
GPU: Radeon 7800 XT
CPU: AMD Ryzen 5900X
RAM: 48GB
GPU: Radeon 7800 XT