lilcw’s “just a simple xor encryption”

Posted on October 4th, 2007 in Solutions by mrhaandi

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

Posted on October 2nd, 2007 in Solutions by mrhaandi

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.