Coder_90's KeyGenMeV3

Author:
Coder_90

Language:
C/C++

Upload:
5:45 PM 11/20/2025

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Platform
Windows

Difficulty:
3.0

Quality:
4.0

Arch:
x86-64

Description

A keygenme crackme. I think its simple and easy :)

Comments
Writeups

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dimkasi2 on 12:31 PM 11/22/2025: decision: https://github.com/mashituladi-star/crackmes.one-Coder_90-keygen-by-dimkasi-

Coder_90 on 8:01 AM 11/23/2025: Well Done! dimkasi2 👍🏻

fakesiva on 5:54 AM 11/26/2025: Solved! As a beginner, instead of writing a keygen script, I traced the execution to the critical comparison and modified the register value at runtime to match the expected hash. Is this considered a valid 'win' for this level?

genass3 on 1:56 PM 11/26/2025: https://github.com/generin0/Keygens, cool task

Elvis on 1:52 PM 11/27/2025: @fakesiva: Nope I don't think it's a valid solution

Coder_90 on 5:54 AM 11/30/2025: genass3 Well Done! 👍🏻

Coder_90 on 5:55 AM 11/30/2025: @fakesiva. No! but at least you are learning 👍🏻

Coder_90 on 6:09 AM 11/30/2025: @patbateman. Well written tutorial thanks for sharing and Well Done! 👍🏻

1337ReverseEngineer on 10:24 AM 12/04/2025: OK crackme

pidorCrackerBitch on 8:17 PM 12/07/2025: https://github.com/panzer000z/CRACK-ME---KEY-GEN-Coder_90-s-KeyGenMeV3

Coder_90 on 4:02 PM 12/13/2025: Well Done! SenorGPT a very detailed explanation 👍🏻

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Solution by patbateman:
In my first writeup I missed the analisys. Hope this one is good :-)

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Solution by SenorGPT:
My first keygen; Win32 GUI crackme with Name + Key validation. Used CFF Explorer for static analysis and x64dbg for dynamic analysis to trace the key validation algorithm. The program processes the name input through a semi-complex encoding function that uses different mixing operations for even/odd characters, involving ROL operations, XOR, and addition with constants. Reversed the algorithm and implemented a Python keygen that generates valid keys for any given name.

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