js-on's Get into that base!

Author:
js-on

Language:
C/C++

Upload:
2020-05-31 15:30

Download

Platform:
Unix/linux etc.

Difficulty:
2.5

Quality:
4.0

Arch:
x86-64

Downloads:
14

Size:
18.16 KB

Writeups:
1

Comments:
9

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 (9)
Writeups (1)

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

x0r19x91 on 2020-06-10 07:46: guess == millis % (sumOfDigits(micros)*micros)

eliyu on 2020-06-29 08:10: 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 2020-07-03 19:51: [Click to reveal]

orid2004 on 2020-10-03 21:10: 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 2020-10-03 21:25: Never mind I read that linux files do not necessarily need extensions in certain situations.

phalange on 2020-11-02 10:08: 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 2020-12-09 18:22: I catched eax with debugger, lol

electric on 2021-01-03 13:02: Anyone else notice that the cross-sum didn't count the last digit?

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Solution by 0xf4lc00n on 2020-07-14 22:14:
Hey this is my "solution" for your crackme. What is more this is my first solved crackme so I don't know if such solution is sufficient. Anyway thanks for that I have a lot of fun during solving ;)

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crackmes.one

crackmes.one

js-on's Get into that base!