Enigma was the mainstream German cipher machine before and during WWII. In these pages we'll attempt to at least partly explain this complicated matter at times. We'll not go into the most complex elements of the machine and its breaking.

Photo of a relatively rare version of Enigma with a printer attached (big box on top).

Allied Breaking of Naval Enigma

Explaining how and when the allies broke the formidable M3 and M4 cipher systems.

Naval Enigma Ciphers

Shows which cipher was used by which U-boat branch during the war.

Enigma related pages

There are many Enigma pages on the web. Here are some of them.

Selected media links

Ultra Goes to War

Lewin, Ronald (2001)
(EUR 15.59)

The secret in building 26

Debrosse. Jim (2004)
(EUR 43.68)

Battle of Wits

Budiansky, Stephen (2000)

The Radar War

Pritchard, David (1989)

Ultra versus u-boats

Roy Conyers Nesbit (2009)
($ 28.58)
(EUR 23.22)