eirikur hallgrimsson ehmadscientistcom uh wwii enigma cracked bletchly park based work poles trying figure would invaded entirely mechanical definitely optical enigma originally broken based bad use practice employed sensibly would lot harder see code book singh doubleday 1999 matter cryptonomicon stephenson fictionalization enigma cracking story pretty accurate eventually get born sideeffect battle britain see computing interference patterns etc makes perfect sense enigma cracked building mechanical systems essentially enigma machines bruteforcing eirikur tue 1 oct 2002 233047 0400 optical analog computing