Adolf Hitler sent coded messages to his generals using this secret coding machine

A secret coding machine used by Adolf Hitler to send coded messages to his generals met the supercomputer which disclosed its secrets and was watched on by veteran operatives whose painstaking work helped end the World War II. The valves, whirring wheels and spinning tors of the two machines were fired up by the scientists at Bletchley Park in southern England, the WWII code breaking headquarters. This way they recreated how German military chiefs sent secret messages and how they were deciphered.

A series of twelve rotors, a million times more complex than the more feted Enigma machine helped Hitler’s Lorenz machine have 1.6 million billion possible coding combinations. Through luck and the ingenuity of engineer Tommy Flowers, scientists were able to deduce how the machine operated and then build a machine to work out the settings of Lorenz’s rotors.

“Colossus” is regarded as the world’s first programmable, electronic digital computer, but received little attention as the project was kept secret for decades, depriving those responsible of due accolades.

Margaret Bullen, who helped build Colossus, and some of the remaining operatives who fed encrypted German messages into the machine, including Irene Dixon, now in her nineties were among those who watched at the National Museum of Computing.

Dixon had been processing the most sensitive of information and she got to know about this decades after the war. “We found out we were intercepting coded messages sent by Hitler to his generals,” she told AFP. “Hitler would’ve been furious if he had known, we were decrypting the messages even before his generals were”.

Information gleaned using Colossus helped the Allies confirm that Hitler mistakenly believed the D-Day landings would target Calais, and experts believe the supercomputer may have shortened the war by two years.

Dixon and other “Wrens” from the women’s branch of the Royal Navy were sworn to secrecy, and even other workers at Bletchley Park were unaware of the existence of the massive computer, which took up a whole room.

“Some of the Wrens did ask why it was so hot (close to the Colossus room), and some used to dry their washing next door,” recalled Dixon. The main Lorenz cypher machine is on loan from the Norwegian Armed Forces Museum in Oslo, but the special keyboard used to send the message to the rotors is a recent discovery. 

(With inputs from PTI)