Sherbius first approached the German military with his idea for a cipher
machine with 'rotating
rotors' in 1918. The German navy liked the idea. It was better than other
cipher machines because its rotating rotors changed the code with every
push of a button. Without a similar machine, the code was practically
German Army began buying the cipher machines and developing them. Soon after WWII
began, the Germans were using it to send important messages in
code. The Germans did this in
case the allied forces intercepted them. They successfully withheld the
deciphering of the enigma code for eight years.
But much to the Germans horror, the enigma code was not secure. After obtaining a package sent to the German Embassy in Warsaw, the Poles acquired knowledge of this secret operation. Factories began producing similar machines, and a team of three top mathematics students began interpreting the code. By June 1939, the Poles had successfully manufactured enigma machines for the French and English along with the decryption information.
Kallis, Stephen A. " Codes and Ciphers." Radio Days. 22 December 2004 <http://www.otr.com/ciphers.html>.
Schwager, Russell. The Enigma Machine. November 2004 <http://www.ugrad.cs.jhu.edu/~russell/classes/enigma/>.
Teitelbaum, Jeremy T. "Rotor Machines." November 2004 <http://raphael.math.uic.edu/~jeremy/crypt/rotor.html>.
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