You are a cryptograph analyst for The Campeonador, godfather of an important drug cartel. He is in competition with Marquandier, a member of the french connection, in the auction process for 500 kg of pure heroin. You have information through different sources that Marquandier has transmitted his ultimate bid to the supplier. If you want … Read more →

he OSB company is actually sued for taking part in a weapon traffic across the Atlantic. They want to eliminate the main witness in this case but they still don’t know where he is hidden. You have intercepted this audio file from the plaintiff to the judge. Can you find something interesting in there ? … Read more →

Challenge 5 : http://challenges.ictf2011.info/challenges/challenge_05 On est tout de suite redirigé vers http://www.ictf2011.info/files/9×9.pdf On peut facilement resoudre le probleme: Il suffit ensuite de faire les additions binaires suivantes: r1 + 1001111 =00000110+1001111 (r1=6) = 101 0101 r2 + 1011001 =00000111 +1011001=110 0000 r3 + 1100100 =00000111+1100100=110 1011 r4 + 1100100 = 00000110+1100100=110 1010 r5 + 1110010 … Read more →