US Pre-War SIGINT

I. Pre-conceptions

A. Racist

B. Strategic

II. Signal Intelligence Service (SIS) vs. Navy Code and Signal Section (OP-20-G)

III. RED

IV. PURPLE

A. MAGIC

V. Stimson’s enthusiasm, Roosevelt’s indifference

VI. MAGIC suggestions of imminent attack

A. But where? Kra Isthamus? Rangoon?

VII. Collection failure

US Wartime SIGINT Successes

I. Japanese Wartime Successes

A. Singapore, Phillippines, Malaya, Dutch East Indies, Burma

B. Threats to India, Australia, and Hawaii

II. Admiral Isoruku Yamamoto’s Midway Plan

III. JN25b

IV. Admiral Chester Nimitz’s Coral Sea trap

V. JN25c

VI. US radio deception

VII. Victory of Intelligence at Midway

VIII. Yamamoto’s assassination

ULTRA

I. GC & CS at Bletchley Park

II. Enigma

A. Commercial Origins

B. Keyboard, Lampboard, Rotors, Plugboard, plus settings key

C. Enigma Simulator Download: http://users.telenet.be/d.rijmenants/en/enigmasim.htm

Simpler Version: http://www.pbs.org/wgbh/nova/decoding/virtwave.html

III. Polish and French efforts

A. Marian Rejewski

B. Intelligence from Hans-Thilo Schmidt

C. Construction of Bombe

IV. British efforts by hand

A. Perforated Sheets

V. GC and CS’s new recruits

A. Alan Turing

VI. Turing’s Bombe

ULTRA Goes to War

I. Dunkirk, Fall of France/Britain stands tall slightly stooped

II. Battle of Britain

A. Luftwaffe numerical superiority

III. British intelligence superiority

A. Defeat of Airforce Enigma

IV. The Blitz

V. So Much, So Many, So Few