Solution by dev.null850:
Detailed write up and C source with keygen.

Solution by jurassicjr:
This is my first crack challenge submit.

Solution by cyclopshx:

Solution by bimkos:
gcc -o crack crack.c && ./crack

Solution by Sm9l:

Solution by ori0n.x3:
A detailed write-up and a keygen in Python

Solution by GaneshG:
Did not understand ALL the code, but managed with some luck. Hack: If name is single character then key == 0. .py file takes name and spits out code

Solution by ex0dea:
For better color-coding, rename save this to a .c file and open in a text editor. We use ghidra to extract the disassembled code and observe important functions. These are then analysed in the comments until we reach the 'solution' of the problem.