crypt crackme:blowfish

[lordor]

Hi,I come back again,this time bring the crypt crackme No3 here,if succeed,you will see a website! Gook Lock!
any quetion,pleas mail to :lordor@digitalnuke.com

by lordor
04.2.20

[ZaiRoN]

Hi lordor,
nice one! A simple blowfish crackme for those whom have never seen this algo before.
Well, all the things that you need to know in order to solve this crackme are the functions used by the blowfish's implementation: the initialization function followed by an encryption/decryption function. Use google to locate (one of the millions) blowfish implementation and then try to understand what the crackme want... ;-)

Zai

[lordor]

hi,zai
This crackme is very simple.I make this crackme just want to let the beginer to learn blowfish algorithm.

the lenght of serial is 20,the first 4 byte is "4002".

[klier]

made a keygen for the blowfish crackme.
works on my computer,not sure on all.
can someone test?

Regards,

[GabryJ]

no, it gives me an error and shutdowns.

Application called (some bytes) from (some bytes) Memory cannot be "read". Click ok to quit or cancel to debug. with a critical message box.

[klier]

shiiit

thank you,

[ZaiRoN]

Well done klier, it works on my xp sp1 machine.
GabryJ, which os are you using?

Zai

[klier]

just curious.
on wich os it's crashing?
i have winxp sp1 to.

anybody

Regards,

[GabryJ]

I have Win2k

It runs, but when I hit Generate or so...it crashes

[klier]

probably smashed the stack

sorry

i learn best with trial and error and error and error....

Regards,

[lordor]

to klier:
your kegen will crash on my win2000sp4.but when using ollDbg to debug the kegen,It can create the right key in memory,gread!

[roticv]

No, you did not preserve ebx, breaking the number one rule in win32asm coding.

[klier]

Then i'm sorry that i broke the number one rule in win32asm coding.

Better next time.

Was my first keygen(no excuse).

Regards,

[dev_zero]

I'm gonna try it in wine linux..
Just wondering does anyone know about som good crypt revers engineering tutorials...? I don't know exactely what to do here?

[mr.x]

http://wwww.digitalnuke was displayed first
"Nuke Group" was displayed second

[nikolatesla20]

Quote:

[Originally Posted by roticv]No, you did not preserve ebx, breaking the number one rule in win32asm coding.

That's why for quick and dirty ASM programs I just use pushad/popad on all my functions.

-nt20

[klier]

Quote:

[Originally Posted by nikolatesla20]That's why for quick and dirty ASM programs I just use pushad/popad on all my functions.

Yep,never forget.