NomanProdhan's License Checker 0x03

Author:
NomanProdhan

Language:
C/C++

Upload:
2022-02-12 03:47

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Platform:
Unix/linux etc.

Difficulty:
1.8

Quality:
4.1

Arch:
x86-64

Downloads:
24

Size:
15.91 KB

Writeups:
6

Comments:
11

Description

This binary is for beginners to practice reversing. Don't patch the binary, try to create a keygen to solve it.

Comments (11)
Writeups (6)

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Shelldon on 2022-02-16 12:49: Very easy crackme. Thanks!

bartp on 2022-02-17 15:36: Enjoyed solving it =)

Q8U on 2022-02-18 22:19: password file zip ????

dev0 on 2022-02-19 11:49: I believe there is a subtle bug in this. Use a key with a 1 or 0x31 byte value as the last letter and see what happens. It appears the address space between the byte for the character and unsigned int are problematic when using the atoi function.

_Umiko on 2022-02-24 13:23: This crackme was pretty hard to solve as a complete beginner :)

ne0n_c4lic0 on 2022-02-27 17:27: Great binary, keep them coming NomanProdhan!

Shreyas on 2022-03-17 20:45: Easy and Well Done

qwertyspark1 on 2022-03-25 20:08: Confirming dev0's comment. There is a small bug. If the code ends in 0, 1, or 2, then the program does not recognize it as a valid license. Otherwise, works great! A fun challenge.

NaNraptor on 2022-04-03 01:37: Thirding the issue with 0, 1, 2 as the last char causing invalid key. Fun challenge otherwise

abspwr on 2022-05-04 22:17: This is the same binary like one posted here by different guy https://crackmes.one/crackme/62327b0433c5d46c8bcc0335.

jjsimpson on 2023-09-19 17:49: Done, really cool challenge

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Solution by myu on 2022-02-21 13:25:
After proving that I'm not able to read the FAQ, I decided to write a detailed description of how I solved this.

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Solution by _Umiko on 2022-02-24 13:21:
Solutions found using rizin Keygen script: https://www.geeksforgeeks.org/count-of-n-digit-numbers-whose-sum-of-digits-equals-to-given-sum/

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Solution by ne0n_c4lic0 on 2022-03-08 17:53:
This walkthrough contains reversing and cracking with python.

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Solution by sg1o on 2022-04-12 17:40:
The correct input is 599999

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Solution by 0xfee1dead on 2022-05-13 15:53:
Done in about 15 minutes. Very nice project for beginners like me.

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Solution by Sandalphon410 on 2023-06-11 11:54:
I tried my best to sum up what I did and my thought process. Hope it stays.

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