Reverse Engineering challenge #74.

Tags: WINDOWS L2 X64 CRACKME LINUX EXEC L1 .

Yet another crackme (or rather keygenme).

Executables:

• Linux x64
• Windows x64

It is just to be run with name and serial number as command line arguments. Valid ones are:

2Z7A7-EK270-TMHR4-BHC71-CEB52-HELL0-HELL0-EONP9
2Z7A7-6I7R9-MZGO9-FDQJ3-JN0Q6-HELL0-HELL0-72KJ9

The first serial number has E feature turned off, the second has E feature turned on.

There are two tasks:

• Easy: by patching, turn on/off all 5 features.
• Medium: generate a serial number with arbitrary features turned on/off.
• Hard: make your own keygen.

Good luck!

More challenges: challenges.re; about solutions: challenges.re/#Solutions.