Keygenning

A tutorial showing how to keygen the Dustyh1981 Easy KeygenMe #1.

In "Toy Project" Kao presents us with a tiny, yet perverse, piece of code to reverse. Given two 32-byte strings A and B, and the 32-bit integers x and y that were used to produce B from A with the following function:
void expand(u8 B[32], const u8 A[32], u32 x, u32 y) { u32 i; for(i=0; i < 32; ++i) { out[i] = (in[i] -x) ^ y; x = ROL(x, 1); y = ROL(y, 1); } } Simple enough. How do we solve it?

This crackme is very interesting. It includes among other a virtual machine with registers from 32 bit to 128 bit, algorithm obfuscation, Taylor expansions. It is really worth having a look at it.

Hi and welcome to another Office Jesus tutorial. I just want to go ahead and say that if you are an ABSOLUTE beginner with no experience debugging or coding (Delphi in this case), you should NOT read this tutorial! I recommend watching Lena151's tutorials; they can be found at www.tuts4you.com. In this tutorial we will be exploring a simple serial checking routine that uses the MD5 hash and the RSA algorithm. I will not go into detail on how MD5 works or how it could be implemented. For more reading about MD5, check out the MD5 tutorials by Encrypto and ARTeam. I will try to explain RSA to the best of my ability. For further reading on RSA, visit RSA Wiki.

In this video I will show you how to penetrate an Android application and static analyze *.apk files for keygenning.

A tutorial on creating an automated keygen.

A video tutorial on auto keygenning LaFarge CrackMe #2.

A tutorial on creating an automated keygen.

Aim: To code a small keygen using WinAPI in C
Target: TDC’s KeyGenMe (CrackME #8)

What we need :
: basic knowledge in C coding
: familiarity with ASM instructions
: a disassembler (IDA)
: a C compiler (VisualStudio2005)

This tutorial has three parts:

Part I: Basic Information
Part II: Reversing the Keygenme and
Part III: Making the keygen

Contents of this package : [ please read the pdfs in this order ]
begin.pdf
part1.pdf
part2.pdf
part3.pdf
finale.pdf
keygen.cpp
keygen.rc
resource.h
tdckeygenme.exe

Here is another tutorial for newbies on Easy KeygenMe #1 by qpt^J. This video is about serial fishing but the algorithm is also explained, so with a use of little brain you can also code it's keygen.

The keygen includes a solver for Euler's tour, also used in WiteG's crackme 3. I hope it will interest you.

It uses a nice virtual machine to process the serial verification. The routine is then rather simple. Good crackme.

A tutorial showing how to keygen the GioTiN Easy KeygenMe #1.

A tutorial on how to reverse a challenge from an old pal Encrypto that I have found lately and I have never reversed until now. The ultimate goal of the challenge is to code a standalone keygen and this is what I have done. The tutorial is a little bit long since it is provided with details so anyone can watch and give it a try.

If you get any kind of problems will be happy to help!

A Shockwave Flash movie tutorial showing a method of keygenning Kurapica's CrackMe #15. It includes the source code for the keygen.

Video tutorial on keygenning Kurapica KeygenMe 2011.

Here is my third tutorial on keygenning and my second tutorial about RSA. I hope it will be useful to you.

Protection: RSA “Modified SHA1“ Custom
Tools: IDA “WinASM“ ImportREC
Difficulty: 2/10 (not for pure beginners)

Welcome to my second tutorial. Today we will be working on a crackme I wrote a few months back. It is wrote in vb6 and compiled to P-Code.

I first became interested in P-Code after downloading a project off PSC and the author claimed it was uncrackable. I gave him a fair run just opened the project long enough to compile it. I loaded it up in Olly and after a few minutes thought it was hopeless.

I then decided to write a little crackme and compile it to P-Code so I could play around with it and have some idea of what was going on.

This might not be the right way but it works so follow along...

In this tutorial I will show you how we can keygen this easy keygenme from pDriLl.

Here is my tutorial for pDriLl's KeygenMe#2. It is using RSA, I hope it will be useful for you and of course this tutorial is not for complete newbies.

This tutorial is for the experienced reverse engineer and not a beginners help. I'm not going deep into everything, but you should be able to follow my ideas. It took me some time to understand how this protection works and I had to invent some tricks to solve it. You might have to Google some topics like RSA or modular inverse to understand the math behind it. I'm also assuming, that you know how to use the tools that I'm going to use.

I hope you learn something from this tutorial and who knows, I can get you interested in iPhone reversing.

Keygenning in Python language.

A Shockwave Flash movie showing a method of keygenning, with Dev C++ with WinAsm + OllyDBG, Dynasty's ScrewMe #1.

A quick video tutorial on keygenning TccT KeygenMe #2 by Tarequl.

A video tutorial on keygenning Encrypto's KeygenMe #4.