| http://www.w3.org/ns/prov#value | - [difficulty: 4][protection: 2nd order polynomial over Zn]This crackme made me read the quadratic residue Wikipedia page AGAIN. One day I might have it memorized :)You end up having to solve:C*X^2 + Y^2 = U (mod N)Where C is constant, U is a number derived from your username, and N is the product of two large primes P and Q. The X and Y are the components of the serial.First you can randomly prod
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