For two months, Elizebeth Friedman worked by hand to crack the codes generated by the German Enigma machine. Until one day she discovered a weakness. Watch an encore of THE CODEBREAKER Tue Dec 28 at 9/8c → pbs.org/wgbh/americanexperience/films/codebreaker | American Experience | PBS

817K views · 2.1K reactions | Germany's poor code skills cost them the First World War. In World War Two, they knew they needed something bigger and better. Enter the Enigma Machine, capable of an almost infinite number of combinations, and almost impossible to crack. But a team of Polish mathematicians were sure that everyone else was going about it all wrong, and set out to break the code for themselves. | War Stories | Facebook