Update

I added the following:

1). In Italian codebreakers of WWII:

The main advantage from reading British naval codes was gained by learning of their plans to attack Italian convoys to N.Africa. In those cases the Italian command quickly warned the convoys and had them change their course.

and in the sources: Naval War College Review article: ‘The Other Ultra: Signal Intelligence and the Battle to Supply Rommel's Attack toward Suez’

2). Added ‘Mathematics and War in Japan’ in the sources of Japanese codebreakers of WWII.

3). Added S.O.E. FIELD CIPHERS in the sources of SOE codes and Referat Vauck.