Quantum Menace

Jack is an eccentric person. He is a cryptologist, the best alive, and this might allow for his eccentricity - in his youth, Jack had single-handedly broken the Enigma code in fifteen minutes. This might also have allowed for the alien species trying to contact him with a slightly more difficult mission: humanity has several months to decipher a mathematical code locked in the long-gone-dust brain of a child dead several centuries ago. Oh, and he might have to volunteer to travel into the sun. Jack's plans for action include a variety of strange human specimens, some world leaders and a load of... cat shit. At stake - the world, the aliens, the entire solar system. Maybe the universe?