2009-02-26

BUBLic's Xor2Zero

[difficulty: 3] [protection: GF(2) math]

This one is really neat! MD5 is used to generate a system of linear equations over GF(2). Your serial encodes a solution to the equations. Only XOR, and AND can be used. A reduced Gauss-Jordan elimination algorithm was employed to make a keygen.

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