BinaryNewbie's Yet Another Keygenme/Crackme

Author:
BinaryNewbie

Language:
C/C++

Upload:
2019-09-14 04:04

Download

Platform:
Unix/linux etc.

Difficulty:
3.0

Quality:
5.0

Arch:
x86-64

Downloads:
32

Size:
4.75 KB

Writeups:
2

Comments:
11

Description

As the title tells, a keygenme challenge, but this time is a bit more complicated... I'm waiting for your solution. Good luck.

Comments (11)
Writeups (2)

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unc4nny on 2019-09-25 15:50: Hey what did you do with the file? I'm thinking you purposefully corrupted it. How did you do it and how do I work my way around it?

BinaryNewbie on 2019-09-25 17:24: Yes, i corrupt it. I used a custom head screwer to do it, but when you understand how it works, it will be easy to patch it, in order to get a disassembly view.

unc4nny on 2019-09-25 19:14: Okay, I'll look into that, thx!

BinaryNewbie on 2019-09-25 20:17: You're welcome. If you have any other doubt, feel free to ask me. Also it's header screwer and not head screwer kkk, my mistake above.

unc4nny on 2019-09-26 13:16: Hey man, I think I've found what I need to do, but I'm no familiar with this technique is there anyway I can contact you so we can leave this discussion out of the comment sections?

BinaryNewbie on 2019-09-26 14:50: Yes, my email is: vitor.oliveira.24.24@gmail.com

newbie_student on 2019-10-01 14:32: i'll give solution, but while busy main idea, that the remainder of the division was zero and then will good msg )

BinaryNewbie on 2019-10-01 15:42: You're fast man, aahah, well done

wannafight234 on 2019-12-04 15:46: The real bother is only fixing the header, rest everything is cool, by the way, nice challenge @BinaryNewbie :)

SYS_V on 2020-01-18 04:38: Solution and write-up posted here: https://binaryresearch.github.io/2020/01/15/Analyzing-ELF-Binaries-with-Malformed-Headers-Part-3-Solving-A-Corrupted-Keygenme.html

dev0 on 2022-07-03 12:58: Really great crackme/keygen @BinaryNewbie! Really enjoyed it and it really tests static disassembly skills with the algorithm used and how it was coded. I do have to ask even though it is in the c_cpp category, did you have some custom assembly in the binary linked in or inline? Great binary and thank you for the challenge.

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Solution by jeffli6789 on 2020-03-18 07:35:

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Solution by pale_delirium on 2025-11-12 02:36:
- dumb_solver.py = Brute force python solver, works with short passwords - keygenme.bndb = Binja DB with functions named properly and some comments added - keygenme_fixed = Keygenme with fixed headers - solve = compiled binary of the below smart solver - solve.c = C code for the above binary - solve_notes.txt = notes

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crackmes.one

crackmes.one

BinaryNewbie's Yet Another Keygenme/Crackme