I started manually reversing the binary using ghidra, but it seems like a problem that angr should easily be able to automatically solve.
```pythonimport angr, claripy
proj = angr.Project('high_quality_checks')
arg1 = claripy.BVS('arg1', 20*8)initial_state = proj.factory.entry_state(args=["high_quality_checks", arg1])
simgr = proj.factory.simulation_manager(initial_state)
# Address 0x400ad2 is found using ghidra (it is the location that prints "You found the flag")simgr.explore(find=0x400ad2, avoid=[])
print(simgr.found[0].posix.dumps(0))  # actf{fun_func710n5}```
![ghidra finding target location](https://raw.githubusercontent.com/NicolaiSoeborg/ctf-writeups/master/2019/%C3%85ngstrom%20CTF%202019/high_quality_checks-ghidra.png)