work was omitted. One sentence hints that Churchill might write something about it in the future, but he never did. Churchill considered the work at Bletchley Park so sensitive he had it put in the highest classification — extending the 30-year secrecy rule. We must presume the decoding schemes were still being

to outstrip our feeble powers. .. . At some stage, therefore, we should have to expect the machines to take control... .”?! A decade or so later, his Bletchley Park colleague I. J. Good wrote, “The first ultraintelligent machine is the /ast invention that man need ever make, provided that the machine is docile en

hitecture 1s conceptually the same generalization—from early digital computers constructed with electromagnetic relays at both Harvard University and Bletchley Park—that occurs in going from a special-purpose Turing Machine to a Universal Turing Machine. Furthermore, his self-replicating automata share a fundamen