KeyGenMe #6 :: .NET :: Difficulty : 4 [HARD !]

KeyGenMe Location : KeyGenMe #6 @ Crackmes.de
Solution Location : Not Solved Yet.

One of my hardest KeyGenMes yet !! KeyGenMe #5. It's coded in VB.NET. Features :
(*) NOT Packed
(*) NOT Encrypted
(*) Kool GFX 'n' SFX

The Rules :
(*) NO Patching
(*) NO Brute-forcing

The Tasks :
1. Find the algorithm for the computations involved.
2. Try to get Status as ":-)".
3. Make keygen to VALID Key for ANY name. Please note that VALID KEYS EXIST FOR ALL NAMES.
Keygens able to generate multiple keys for each name will be preferred.
4. Write a descent tutorial. ;)

The Hint :
==========---
It's .NET, you've the source code ! So, no hints.. ;-)

Readers, if you solve this, please upload your solution to CrackMes.de.

KeyGenMe #5 :: .NET :: Difficulty : 4 [HARD !]

KeyGenMe Location : KeyGenMe #5 @ Crackmes.de
Solution Location : Solution by indomit.

One of my hardest KeyGenMes yet !! KeyGenMe #5. It's coded in VB.NET. Features :
(*) NOT Packed
(*) NOT Encrypted
(*) Kool GFX

The Rules :
(*) NO Patching
(*) NO Brute-forcing

The Tasks :
1. Try to get Status as "VALID".
2. Find the algorithm for the computations involved.
3. Make keygen to VALID Key for ANY name. Please note that VALID KEYS EXIST FOR ALL NAMES.
4. Write a descent tutorial. ;)

The Hint :
==========---
Think about MID(KEY,2,3) where KEY is ANY VALID KEY. ;-)

Readers, if you solve this, please upload your solution to CrackMes.de.

KeyGenMe #4 :: C++ :: Difficulty : 4 [HARD !]

KeyGenMe Location : KeyGenMe #4 @ Crackmes.de
Solution Location : Not Solved Yet.

My hardest KeyGenMe yet !! KeyGenMe #4. It's coded in ANSI C++. Features :
(*) NOT Packed
(*) NOT Encrypted

The Rules :
(*) NO Patching
(*) NO Brute-forcing

The Tasks :
1. Try to get Status as "VALID :) !".
2. Find the algorithm for the computations involved.
3. Make keygen to VALID Key for ANY name. Please note that VALID KEYS EXIST FOR ALL NAMES.
4. Write a descent tutorial. ;)

The Hint :
==========---
Think about solving a 15-puzzle. ;)

Readers, if you solve this, please upload your solution to CrackMes.de.