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How do you make a KeyGen

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How do you make a KeyGen
Hey i was wondering if anyone here knew how to make a key generator for programs, games. If you do please tell me, or if you could find a tut on the web that would be great.

P.S. I searched the web for this and came up with 1-3 different ways of doing this, not sure which is the best way!
#1 ·
Well, usually there is a pattern you have to solve.
#2 ·
Keygen
A pattern eh? Please do explain if you can- or direct me to a site that can explain it
#3 · edited ·
dbmain, Thanks for the VERY useful link, that forums has a ton of useful information, thanks again
#5 ·
I didn't see anything just this:

phpBB : Critical Error

Error doing DB query userdata row fetch

DEBUG MODE

SQL Error : 145 Table './forum/phpbb_users' is marked as crashed and should be repaired

SELECT u.*, s.* FROM phpbb_sessions s, phpbb_users u WHERE s.session_ip = '18e7ac1c' AND s.session_user_id = -1 AND u.user_id = s.session_user_id LIMIT 0, 1

Line : 366
File : sessions.php
#6 ·
Quote Originally Posted by TJM View Post
A pattern eh? Please do explain if you can- or direct me to a site that can explain it
Yes...pattern as in a mathematical algorithm. You need to be a smart fucker to solve the pattern.
#7 ·
To help you i wrote a quick tutorial just a few minutes ago, Lol. Bypassing as
always been easier then KeyGenerating for me but here's the basic concept at least?:

I started with a C++ program to use as example, I realize this is a Visual Basic Section but these are basic functions easy to transfer and the Assembly is the focus, anywho:

Code:
#include <iostream>
using namespace std;

int main() {

int x;
int y;
int z;
cout<<"Please enter number: \n";
cin>>x;

y=x*2;
y+=1;

cout<<"Please enter Serial Key: \n";
cin>>z;
if ( y == z ) { 
cout<<"Correct Welcome! \n";
}
else {
cout<<"You fail, bye \n";
}
system("pause");
}
So compiled into an exe like the program you want to keygen, we run it,

Attach it with OllyDBG...REWIND, Scroll Down - find the function in dissasembly:

Obviousally reversing skills are a must. After noting out each part - you'll inevitably run across:

Code:
...(start removed unnececary for example) 
...
004013BA  |. C74424 04 0000>MOV DWORD PTR SS:[ESP+4],Untitled.004400>;  ASCII 

"Please enter number: 
" 
004013C2  |. C70424 C033440>MOV DWORD PTR SS:[ESP],Untitled.004433C0
004013C9  |. E8 FAAC0300    CALL Untitled.0043C0C8
004013CE  |. 8D45 FC        LEA EAX,DWORD PTR SS:[EBP-4]
004013D1  |. 894424 04      MOV DWORD PTR SS:[ESP+4],EAX
004013D5  |. C70424 6034440>MOV DWORD PTR SS:[ESP],Untitled.00443460
004013DC  |. E8 AF6D0200    CALL Untitled.00428190

004013E1  |. 8B45 FC        MOV EAX,DWORD PTR SS:[EBP-4]
004013E4  |. 01C0           ADD EAX,EAX
004013E6  |. 8945 F8        MOV DWORD PTR SS:[EBP-8],EAX
004013E9  |. 8D45 F8        LEA EAX,DWORD PTR SS:[EBP-8]
004013EC  |. FF00           INC DWORD PTR DS:[EAX]
004013EE  |. C74424 04 1700>MOV DWORD PTR SS:[ESP+4],Untitled.004400>;  ASCII 

"Please enter Serial Key: 
"

004013F6  |. C70424 C033440>MOV DWORD PTR SS:[ESP],Untitled.004433C0
004013FD  |. E8 C6AC0300    CALL Untitled.0043C0C8
00401402  |. 8D45 F4        LEA EAX,DWORD PTR SS:[EBP-C]
00401405  |. 894424 04      MOV DWORD PTR SS:[ESP+4],EAX
00401409  |. C70424 6034440>MOV DWORD PTR SS:[ESP],Untitled.00443460
00401410  |. E8 7B6D0200    CALL Untitled.00428190
00401415  |. 8B45 F8        MOV EAX,DWORD PTR SS:[EBP-8]
00401418  |. 3B45 F4        CMP EAX,DWORD PTR SS:[EBP-C]
0040141B  |. 75 16          JNZ SHORT Untitled.00401433
0040141D  |. C74424 04 3200>MOV DWORD PTR SS:[ESP+4],Untitled.004400>;  ASCII 

"Correct Welcome! 
"
00401425  |. C70424 C033440>MOV DWORD PTR SS:[ESP],Untitled.004433C0
0040142C  |. E8 97AC0300    CALL Untitled.0043C0C8
00401431  |. EB 14          JMP SHORT Untitled.00401447
00401433  |> C74424 04 4500>MOV DWORD PTR SS:[ESP+4],Untitled.004400>;  ASCII "You 

fail, bye 
"
0040143B  |. C70424 C033440>MOV DWORD PTR SS:[ESP],Untitled.004433C0
00401442  |. E8 81AC0300    CALL Untitled.0043C0C8
00401447  |> C70424 5500440>MOV DWORD PTR SS:[ESP],Untitled.00440055 ; |ASCII 

"pause"
0040144E  |. E8 8DF20000    CALL <JMP.&msvcrt.system>                ; \system
00401453  |. B8 00000000    MOV EAX,0
00401458  |. C9             LEAVE
00401459  \. C3             RETN
Remember, direct numerical input stores in EAX on default. You can see how they move it into accessible pointers slowly which serves no more then to trick you, in my book.

The primary focus here is the only two times memory is mathetmatically manipulated in value...

004013E4 |. 01C0 ADD EAX,EAX

004013EC |. FF00 INC DWORD PTR DS:[EAX]

Noted they move EAX elsewhere as well as mentioned above, it's still added, and EAX is still increased (+1) , after being doubled, as the only two direct value manipulations...

Therefore your keygenerator is no other then

Code:
#include <iostream>
using namespace std;

int main(){

int x;
int y;
cout<<"Please enter number: \n";
cin>>x;

y=x*2;
y+=1;

cout<<"Serial Key Is: \n";
cout<<""<<y<<"";
system("pause");
}
Done, hope it helps at least a lil...
#8 · edited ·
Generally there is a check function, in which the code you passed is checked mathmatically. Reverse engineer the function and you should be set.
#9 ·
So I tried using those codes and downloading the programs......I opened it and was like aw fuckz naw! I can't do this to many binary lookin codes
#10 ·
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