Author:
Towel

Language:
C/C++

Upload:
3:20 AM 06/06/2020

Platform
Unix/linux etc.

Difficulty:
3.0

Quality:
4.0

Arch:
ARM

Description

Straightforward crackme, standard rules apply: no patching, find the correct input. Features very light ARM assembly obfuscation, and was originally released at UMDCTF 2019.

• Comments
• Solutions

jeffli6789 on 5:14 PM 06/17/2020: Nice challenge in general! angr does not work so it requires some manual work. I dumped the equations with Ghidra and solved it with z3.

SKyRaphYDrEfuNTutai on 7:43 PM 06/19/2020: @jeffli6789 I was able to solve with angr, check out my posted solution.

kkk on 8:45 AM 12/02/2023: solve it with simple idapython script to extract things z3 needed

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