John the referee is a challenge of PoliCTF 2015
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John is one of the most famous referee and security expert in the world. He loves encryption and his referee uniforms. You can find them on his online store. Unfortunately his best uniform is not on sale for anyone. I know that it is available only on invitation. I want that uniform!
flag{Damn_John!_CBC_1s_not_the_best_s0lution_in_this_c4se}