ULTRA in the Atlantic:
German Naval Communications Intelligence
 
   
SRH-024
national security agency
central security service


Table of Contents

Chapter   Page
I Organization and Working of German Naval Communications Intelligence 1
II Intelligence Disseminated to U-boats and the Sources Acknowledged in U-boats Traffic 11
III German Intelligence on Allied Convoys in the Atlantic 21
IV Compromise of Naval Ciphers #3 and #4 35
V "B-Dienst" Aboard U-boats 55
VI German-Japanese Cooperation in Communication Intelligence 65
VII German Fears of the Compromise of Their Naval Cipher 83



Transcribed and formatted by Marco Bricchetti for the HyperWar Foundation