spitfire on 2025-11-21 01:35:
This program expects the username to be between 8 and 12 characters. Then, it converts the characters at even indexes to lowercase and the characters at odd indexes to uppercase. After that, for some reason, it only copies the first 8 characters of this new string into another buffer and applies atoi to it.
If the first character of the username is a letter, then atoi returns 0, which ends up being the correct serial number. I’m not sure if this was intentional, but that’s the result. You can even create a serial generator just by applying atoi to the username.
In short: for any username that starts with a letter, the serial number is 0.
yatanim on 2025-12-10 15:17:
Just read the code in ghidra
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Solution by mZynths on 2025-11-20 09:28: This is my first crackme and reverse engineering writeup!
I may have gone a bit overboard with the writeup, I was very excited haha.