nextco's Crackme 4 by @rextco

Author:
nextco

Language:
C/C++

Upload:
2019-02-16 20:41

Download

Platform:
Windows

Difficulty:
2.0

Quality:
4.0

Arch:
x86

Downloads:
24

Size:
3.11 MB

Writeups:
0

Comments:
8

Description

Target: Get the flag I enjoy a lot with crackmes in which I learned new things. hopefully this crack will fulfill that purpose

Comments (8)
Writeups (0)

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GautamGreat on 2019-02-20 09:26: [Click to reveal]

nextco on 2019-03-18 22:11: Hints: Look the logo. 0, 1, 2, 3, ...,7

AshVsEvilDead on 2019-04-08 18:25: There is a complex relationship between the name and the key. (1st) the key is in the form XXXXX-XXXXX-XXXXX-XXXXX-XXXXX. The "-"s are discarded and its passed through a 'hashing' algorithm of some sort to produce 16 characters of the hashed key. (2) The name is 'topped up' to 16 characters by looping through the characters from zero. The trailing zero is included in the characters. (3)The key hash is appended to the topped up name and the first 30 characters are passed through another hashing algorithm. The result of this is a 2 letter code that is compared to the last 2 digits of the hashed key. They should be equal. One can see that the relation ship between the name and the key is complex. I wonder what algo u are using?

nextco on 2019-04-09 10:12: @AshVsEvilDead, i think you comment is for another crackme, because the format on this crackme is different. Only numbers ( blocked by gui)

Xor0 on 2019-05-02 19:34: Another nice one from @nextco. I found the fl4g ;-) I don't know if i will post a full solution. I just brute forced this, but the flag message suggests maybe there is a better way. Certainly we could have just did some simple xor key brute forcing on the MessageBox string. See cryptopals set 1 challenge 6.

sndress on 2019-10-12 08:22: This is the second week I've been trying to crack this, but it's not working, can you give me a clue?

Genka on 2019-10-17 12:46: What is the task for this crackme?

Harshil55 on 2020-05-10 15:37: I can't figure out

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nextco's Crackme 4 by @rextco