Author:
destructeur

Language:
C/C++

Upload:
5:22 PM 02/20/2020

Download

Platform
Unix/linux etc.

Difficulty:
2.5

Quality:
4.0

Arch:
x86-64

Description

You have to find a flag. The program may tell you if the one you gave in input is good.

• Comments
• Solutions

timotei on 7:28 PM 02/24/2020: "Well played! This is the only valid flag." Easy to trace. Good for beginners. Level 1.

ragnar_crackbeard87 on 12:06 AM 02/26/2020: I hope someone writes a solution for this. I have been trying it all day. I got the first key easily enough, the one that doesn't print anything '1a4f'... However I've reversed every single line of user-code in this thing and can't figure out how this can work. I patched it but certainly that's not the solution, as I see timotei posted the actual good-boy.

4rr4y on 12:48 AM 02/26/2020: @ragnar_crackbeard87 I submitted a solution but its pending approval i think~ perhaps a good hint for you is there is more stuff other than the main() function :)

ragnar_crackbeard87 on 4:26 AM 02/26/2020: Thank you 4rr4y I GOT IT FINALLLY :):) A perfect hint. It told me hardly anything but i knew to stop trying to figure out how this main code could possibly be doing some magical jump haha

luc4sb3rt1n on 3:43 PM 03/14/2020: @timotei, what you mean by "Easy to trace"? Just to be clear, I did it but debugging with gdb. Do you know any other (easy) way to get that?

tim0tei on 9:33 AM 03/15/2020: @luc4sb3rt1n What I meant was that the codeflow is good to follow and understandable.

luc4sb3rt1n on 3:21 PM 03/15/2020: Oh, got it @timetei, thanks

robon on 1:52 AM 04/24/2020: @luc4sb3rt1n Use edb-debuger

ttotons on 5:10 PM 05/10/2020: Wow finally I did. As a beginner it took me days until I used some hints, because I wasn't getting any closer. :) But I gained some experience.

mistilteinn on 10:55 AM 05/11/2020: look at author's name : )

tristansca on 12:22 AM 11/09/2020: How do you extract it it asks for code?

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