Keygenning Tutorial#1

by stan4oo

Hello! to all! I am not so good at keygenning but in this tutorial i am gonna explain how to keygen a this simple crackme.I have to say that i am not so good at English.So i am sorry abaut the mistakes i will made!

Tools:

Win32dasm8.93  

Fire up Win32dasm and start the crackme.exe.Then go to the string references and search the string "Bad Boy,read more and more Tuts" .Then doubleklick on this string.And u must see this:

Then u must see the picture above.The red arrow point to the adress 004011AB of the counditional jump where the procedure is called.So we klick on  :"Goto Code Location" from Goto-menu and write the adress 004011AB .Then klick on "OK" and u will see this JMP: and some lines above the Funcion Getdlgitemtexta.This function takes the written string in the edit box.So that means that this conditional jump is our target.When we want to crack the crackme.We must crack this two bytes.(jne with je[75 with 74])But our purpose is to keygen this crackme.Therefore we look some lines above.(Scroll up a little until u see the next getdlgitemtexta.

The above Getdlgitemtexta takes our name.and after the line:

beginnt calculation of our string.I think the obove comments are clear.The asscii code of our chars are added and the sum is multiplated with 28.Then is added 19.And that's it it was not so difficult,naeh:)?

Actually,it compares only the 4 chars of our serial and the good serial.In memory the chars are in reversed order.So if u use Softice u will see the vier chars of your name reversed.

The whole algorithum is like this:

Calculation:

asscii(name)*28+19

For my name the good serial is:

name:stan4oo

serial:28505

Greetings going to

personal:^Shade^,Plux,Pumqara,BuKoo,Scheisser,_pe6o_,Cyco,El_Bantchef,werder,Black_Bull,Muffy and oders

special greetz:И сега малко по personall greetings.Искам да посветя този Тут на един от фоундърите на #pulse-^Shade^Tой е човека които ме въведе в кракването и затова съм му много благодарям.Не ме бива мн във обясненията,но тои ме въведе и8 ме напуства и помага и досега.Затова ^shade^  човече продулйаваи да кракваш:P;)

cracking groups:#cracking4newbies