fortu’s “KeyGenMe #1″
Target: fortu’s “KeyGenMe #1″
Difficulty: 5/10
Protection: BigNumber equation
Download: tutorial
Note: The keygen is written in C# and contains easy to use BigNumber arithmetics in finite fields.
lilcw’s “just a simple xor encryption”
Target: lilcw’s “just a simple xor encryption”
Difficulty: 3/10
Protection: SMC
Download: tutorial
Note: The author rated this on at level 9, but I’ll show some weaknesses, so it becomes really easy.
bLaCk-eye’s NiGHTMARE
Target: Ms-Rem’s KeyGenMe
Difficulty: 8/10
Protection: HPC, GF(2^64)
Download: tutorial, keygen incl. source(C++)
Note: To solve this I implemented Pohlig-Hellman decomposition and Pollard’s Rho algorithm - I think it is worth a look.
Ms-Rem’s KeyGenMe
Target: Ms-Rem’s KeyGenMe
Difficulty: 8/10
Protection: VM
Download: tutorial, keygen incl. source(C++)
bLaCk-eye’s SiEGE Toolme
Target: bLaCk-eye’s SiEGE Toolme
Difficulty: 5/10
Protection: Modular Arithmetic, Polynomials, *Obfuscation*
Download:tutorial, keygen incl. source(C++)
Brainrain’s HyperCube
Target: Brainrain’s HyperCube
Difficulty: 5/10
Protection: Matrices over F2
Download: removed on request
luxor’s Keygenme III v1.0
Target: luxor’s Keygenme III v1.0
Difficulty: 5/10
Protection: Cubic Polynomial over Zp
Download: tutorial, keygen incl. source(C++)
Cyberbob’s PowerPuff Girls
Target: Cyberbob’s PowerPuff Girls
Difficulty: 7/10
Protection: RC2, SHA1, TIGER, Modular Arithmetics
Download: tutorial, keygen incl. source(C++)
TiGa’s CryptoKeygenMe #1
Target: TiGa’s CryptoKeygenMe #1
Difficulty: 4/10
Protection: Custom MD5, Modular Arithmetics
Download: tutorial, keygen incl. source(C++)
halsten’s CryptoMe1
Target: halsten’s CryptoMe1
Difficulty: 4/10
Protection: Blowfish, custom
Download: tutorial, keygen incl. source(c++)