Level : 3/10
OS : windows
Language : ASM


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clone keygenme
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I was playing with some crackme template and decide to make small keygenme. Objectve of this crackme is to make valid keygen. No patching! Algorithm is very easy.

I stumbled accross this introduction to reverse engineering. Thought it might be useful to some of our visitors. Unfortunately the document is not 100% complete. On the other hand it features some interesting topics, including some unix stuff.

Level : beginner

OS : windows
Language : ASM

This formula is often use to check the validity of a credit card.
Think of it as a CRC checksum, it validates checksums of creditcards.

For more information regarding the algo, check out www.reversing.be/forum/viewtopic.php?p=2103

Now, let's get coding. I've written a DLL with function CheckCC() using fasm. The function accepts one parameter (buffer).

Level : 3/10
OS : windows
Language : win32asm



Falcon1Crackme3Hi,
this is the 3rd one, not difficult at all.
Just a few anti-debugging tricks...and a keyfile...

Have Fun!!!

Level : newbie

TDC's KeyGenME (CrackME #8) Solution Tutorial

Aimed For : Newbies in reversing, with basic knowledge of assembly instructions
(former experience with easier KeyGenMEs can be helpfull though)

Difficulty: 2/10

Tool Used : OllyDbg