Dec0deMe #1:
http://cryptolib.com/ruptor/Dec0deMe1.zip (published December 19, 2001)
Also published on the famous crackmes.de site: NO SOLUTION SO FAR

Dec0deMe #2b:
http://cryptolib.com/ruptor/Dec0deMe2b.zip (updated April 28, 2002 - a major bug fixed thank to RElf)
Solved by Restless Elf! His solution: http://cryptolib.com/ruptor/Dec0ded2b.rar (solved April 29, 2002, the archive seems broken)

CHAKRA:
http://cryptolib.com/chakra - Ruptor's manual pen-and-paper cipher; still being refined. The challenge however has not been broken yet.

Ruptor's SFC System DLL Forgery:
Source: http://cryptolib.com/ruptor/forge.c
Executable: http://cryptolib.com/ruptor/forge.exe

All the feedback is welcome!

Please e-mail solutions to Ruptor.

How to get into your Windows 2000 box if you forgot/neverknew your password [for free]:

1. Use GOOGLE to find Norton Disk Editor, download it
2. Boot in good old DOS
3. Run Disk Editor
4. NTFS: Open the stuffed partition on whatever physical drive you're after 4. FAT: Find and open its WINNT\SYSTEM32\KDCSVC.DLL file, it would be faster
5. Search for 68 70 21 F1 6C
6. Find the closest following 80 B8 C1 00 00 00 00 0F 84 66 01 00 00 in the same or the following sector

Note: If you can't find any of the above, you're using a strange Service Pack I haven't tested it with, or the file system on that volume is compressed. Don't change anything. It won't work. E-Mail me.

7. Edit that pattern to read 80 B8 B8 00 00 00 nn 0F 84 9A 03 00 00

Note: If you can't edit anything, disable Read-Only Mode. Duh!

8. Save it and... here's the secret:
9. The nn above is an arbitrary non-zero number of invalid logon attempts before it will let you in with a blank password!
10. You will be able to login as ANY user ONLY with a blank password ONLY precisely after the nn logons you specified in p.7.

Note: The correct passwords will still work. If you miss the next logon, you will have to reboot before you can try again. It will let you in if you enter a blank password only on the (nn+1)th attempt.

Enjoy! ;-)

Ruptor's Incredible 16 Byte Intro: http://cryptolib.com/ruptor/Ruptors_Incredible_Intro.exe - watch it for a while. So much variety for 16 bytes!