timotei on 7:09 PM 04/04/2019: Like this one. Good to trace and not that hard to reverse.
I found this login: lozlvl* (* I don't want to reveal everything :-)
garmoen on 7:12 PM 04/06/2019: Found it. Fun to reverse C++ classes
BinaryNewbie on 5:08 PM 08/10/2019: Very simple, although C++ is very weird ahaha
rustymagnet on 12:00 PM 03/03/2020: I would say this is a l3 challenge, due to the amount of C++ Symbols. There is a bit of XOR magic in here. Trust your debugger (gdb) and set Breakpoints at good points.
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Solution by BinaryNewbie: It contains a write-up and a python script.