Solution by kellek on 2018-09-15 10:29:
Solution attached. Contains the reverse engineered crackme (source file) and gdb dump comments.

Solution by Tristan on 2018-09-19 21:52:
obviously, no keygen.py is required for this one

Solution by TristanRice on 2018-09-26 15:58:
Solution attached

Solution by mogamiriver on 2018-11-11 10:00:
Analysis of the main section and a one-liner keygen

Solution by MaksLoboda on 2018-11-18 15:02:
My first ever solution(attached)

Solution by nutcake on 2018-12-07 00:45:
Text file with walkthrough.

Solution by thehood on 2018-12-13 17:42:
Text File Walkthrough with the radare2 assembly code.

Solution by Yuri on 2018-12-25 07:58:
My Solution, text file with source and gdb dump.

Solution by niedziol on 2019-01-12 18:39:

Solution by calo on 2019-02-08 05:22:
Was fun. Write up includes, challenge rewrite, flag_generator python script and commented assembly (r2)

Solution by D4RKFL0W on 2019-03-02 22:37:

Solution by migsaldivar on 2019-03-13 00:05:

Solution by chankruze on 2019-03-21 23:20:
changing the implementation-defined signature to did the magick.

Solution by elprofesor on 2019-04-02 14:09:
You will find: "decompilation.txt" which is the decompilation of main function. "readme.md" which explains the whole process. "keygen.py" which generate 10 keys.

Solution by Antricks on 2019-07-05 16:47:
I pasted a controll-flow graph from radare 2 here so maybe some text editors will not show this file correctly. With vscode or kate it should work :D

Solution by neighborino on 2019-07-21 11:01:
Solution attached. Solution includes disassembled main function with comments

Solution by usr404 on 2019-08-17 10:00:
Decompiled using Ghidra & performed simple examination of control flow of `main` function

Solution by vastopol on 2019-09-08 19:25:

Solution by Bkamp on 2019-12-03 12:54:
Very cool crackme. Enjoyed quite a bit :)

Solution by richardcanuck on 2019-12-06 16:16:
Decompiled using Ghidra. The file contains the commented code and the solution!

Solution by 4rr4y on 2020-02-24 08:40:
First crackme

Solution by tgsm on 2020-05-09 06:24:

Solution by rek on 2020-06-15 04:58:

Solution by arkountos on 2020-12-18 12:46:

Solution by toolb0x on 2020-12-21 12:16:
thanks, it was funny

Solution by qjig on 2020-12-29 02:31:

Solution by oracle on 2021-04-14 12:07:
first solution

Solution by redkage on 2021-04-28 11:51:
Used Cutter for disassembly

Solution by pilot538 on 2021-06-04 18:46:

Solution by ntk on 2021-09-27 07:38:

Solution by MANA624 on 2021-10-08 03:41:
This is very simple RE problem. Here's a simple solution :)

Solution by Sanca on 2025-02-05 18:34:
my first crackmes problem

Solution by fieldhamster on 2025-02-11 23:42:

Solution by DRS_Steel on 2025-12-29 22:01:
Static analysis using objdump. Identified 3 checks in main(): 1. argc == 2 (need exactly 1 argument) 2. strlen(password) == 10 (0xa in hex) 3. password[4] == '@' (0x40 in hex) Valid password format: XXXX@XXXXX (10 chars, '@' at index 4) Example: test@psswd → flag{test@psswd}