An earlier attempt to perform this action used a "characteristics" method invented by Marian Rejewski, but his work was undone with the addition of two more (*) rotors.
In his namesake "tip," John Herivel made a notable contribution to this effort by accounting for the laziness of certain enemy workers. An earlier attempt to perform this action used a "characteristics" method invented by Marian Rejewski, but his work was undone with the addition of two more (*) rotors. This effort was codenamed Ultra, and it used machines like the Bombe in its central location in Bletchley Park. Alan Turing contributed to the success of this effort, which allowed the movement of U-boats to be predicted ahead of time. For 10 points, describe this effort to solve an "unbreakable" German war code.
In his namesake "tip," John Herivel made a notable contribution to this effort by accounting for the laziness of certain enemy workers.
cracking the Enigma code (accept synonyms for cracking like solve or break; accept Ultra before mention; prompt on codebreaking or cryptography)