Author:
js-on

Language:
C/C++

Upload:
3:30 PM 05/31/2020

Download

Platform
Unix/linux etc.

Difficulty:
2.5

Quality:
4.0

Arch:
x86-64

Description

I'm not sure how hard this will be, cuz it's my first crackme. Just figure out the password to get the secret message. Have fun trying it if you have time ;)

• Comments
• Solutions

jeffli6789 on 11:45 AM 06/09/2020: RzAwRCBKMEIhCg A moderately complex algorithm accompanied by some mild math obfuscations. Probably a level 2-3.

x0r19x91 on 7:46 AM 06/10/2020: guess == millis % (sumOfDigits(micros)*micros)

eliyu on 8:10 AM 06/29/2020: I had to patch it or use gdb on the fly to get the answer. My attempts to make a bash program that extracts the timestamp from runtime and perform the algorithm never worked. Anyone lucky to use an actual input into the program to get the answer?

babyw0rm on 7:51 PM 07/03/2020: "RzAwRCBKMEIhCg" is this the answer. Sorry I'm new to reverse engineering.

orid2004 on 9:10 PM 10/03/2020: Hey, I'm new to rev eng and don't know what to do with guessme FILE type. I can work with exe files in IDA or java files in jd gui, but guessme file has no type. How can I decompile and execute the program? Thank you

orid2004 on 9:25 PM 10/03/2020: Never mind I read that linux files do not necessarily need extensions in certain situations.

phalange on 10:08 AM 11/02/2020: in the solution , they have used gdb on the re written code, is it possible to get answer by using gdb on the original binary

chelik on 6:22 PM 12/09/2020: I catched eax with debugger, lol

electric on 1:02 PM 01/03/2021: Anyone else notice that the cross-sum didn't count the last digit?

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