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NSA Secrets Declassified: Pearl Harbor Revisited, West Wind Clear - Cryptology and the Winds Message Controversy, The Black Chamber, Navy Cryptology, Signal Intelligence, Linguists, Purple Machines

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Professionally converted for accurate flowing-text e-book format reproduction, this important compilation of NSA publications and documents provides truly unique insights into the Japanese attack on Pearl Harbor which led to American involvement in World War II. As a bonus, we've included our new intelligence title, 2015 U.S. Intelligence Community Worldwide Threat Assessm Professionally converted for accurate flowing-text e-book format reproduction, this important compilation of NSA publications and documents provides truly unique insights into the Japanese attack on Pearl Harbor which led to American involvement in World War II. As a bonus, we've included our new intelligence title, 2015 U.S. Intelligence Community Worldwide Threat Assessment. Three documents are featured: United States Cryptologic History: Pearl Harbor Revisited: U.S. Navy Communications Intelligence 1924-1941, West Wind Clear: Cryptology and the Winds Message Controversy - A Documentary History, and NSA Pearl Harbor Reviews. United States Cryptologic History: Pearl Harbor Revisited: U.S. Navy Communications Intelligence 1924-1941: Foreword * Introduction * Earliest Efforts * Role of ONI * Early War Plans * Japanese Fleet Capabilities and Intentions * Cryptologic Challenge: Navy-Army Cooperation * Bureaucracy Prevails * Status Quo in the Pacific * A New Attempt at Cooperation * Japanese Cryptography * Recovering the "Blue Book" * Introducing JN-25 * Turning Victory into Defeat * Introducing "Purple" * Disarmament: Paying the Price * Confusing Diplomacy * Struggling for Resources * Planning for War * War Games * Pacific Buildup * National Emergency * Circumstances Favor Diplomatic Targets * Information Gaps * Cooperation with Allies * The Move to Hawaii * Support to the Pacific Fleet * Japanese Intentions Revealed * Support to Asiatic Fleet * Japanese Strategy * Japanese Navy * Diplomatic Messages * Warning Messages * Reaction * COMINT after the Opening Attack * Conclusion * Appendix A: Naval Messages Intercepted between 5 September and 4 December 1941 * Appendix B: Summary of Diplomatic Messages July-November 1941 * Appendix C: Highlights from COM-14 Daily COMINT Summary * Notes * Abbreviations Used * Notes on Sources Bibliography West Wind Clear: Cryptology and the Winds Message Controversy - A Documentary History: Chapter 1: Background: Interwar U.S. - Japan Relations and Cryptology * United States-Japan Relations, 1919-1940 * (Japanese Diplomatic and Naval Cryptology and American Codebreaking between the Wars) * United States - Japan Relations Worsen, 1940-1941 * Chapter 2: Intercepted Japanese Diplomatic Messages Reveal a Warning System, 19 November-28 November 1941 * The Cryptography of the J-19 System * Japan Fields a New Diplomatic Manual Cryptographic System * The Americans Solve the New Manual System November 19: Japanese Message #2353 - The First Winds Instruction Message * November 19: Japanese Message #2354 - The Second Winds Instruction Message * Chapter 3: The Hunt for the Winds Execute Message, 28 November — 7 December 1941 * The Search Begins — 28 November 1941 * Tokyo Sends More Instructions about Destroying Cryptographic Material * The Hidden Word Message — A Complement to the Winds Messages * Tokyo Sends Even More Instructions, 28 November-6 December * 7 December 1941: The Hidden Word Message Is Sent * 7 December 1941: The Winds Execute Message Is Sent * Chapter 4: The Winds Controversy: Myth and Reality * Captain Laurance Safford — In the Eye of the Controversy * Safford Searches for the Missing Winds Execute Message * Safford's Detailed Claim about the Winds Execute Message — February 1946 * Examining Safford's Version(s) of Events * The Intercept of the Winds Execute Message * Actions Taken in the Aftermath of the Winds Execute Message * Who Saw the Winds Execute Intercept or Translation? * The Matter of Missing or Destroyed Records * Some Observations on Captain Laurance Safford * The Case of Captain Alwin Kramer's Changing Testimony * What the Japanese Said about the Winds Execute Message * What the British and Dutch Radio Monitors Heard * The Winds Controversy Resurfaces — Ralph Briggs' Claim * The Winds Execute: The Final Casting * Afterword: The Winds Message, American Cryptology and History * The Impac


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Professionally converted for accurate flowing-text e-book format reproduction, this important compilation of NSA publications and documents provides truly unique insights into the Japanese attack on Pearl Harbor which led to American involvement in World War II. As a bonus, we've included our new intelligence title, 2015 U.S. Intelligence Community Worldwide Threat Assessm Professionally converted for accurate flowing-text e-book format reproduction, this important compilation of NSA publications and documents provides truly unique insights into the Japanese attack on Pearl Harbor which led to American involvement in World War II. As a bonus, we've included our new intelligence title, 2015 U.S. Intelligence Community Worldwide Threat Assessment. Three documents are featured: United States Cryptologic History: Pearl Harbor Revisited: U.S. Navy Communications Intelligence 1924-1941, West Wind Clear: Cryptology and the Winds Message Controversy - A Documentary History, and NSA Pearl Harbor Reviews. United States Cryptologic History: Pearl Harbor Revisited: U.S. Navy Communications Intelligence 1924-1941: Foreword * Introduction * Earliest Efforts * Role of ONI * Early War Plans * Japanese Fleet Capabilities and Intentions * Cryptologic Challenge: Navy-Army Cooperation * Bureaucracy Prevails * Status Quo in the Pacific * A New Attempt at Cooperation * Japanese Cryptography * Recovering the "Blue Book" * Introducing JN-25 * Turning Victory into Defeat * Introducing "Purple" * Disarmament: Paying the Price * Confusing Diplomacy * Struggling for Resources * Planning for War * War Games * Pacific Buildup * National Emergency * Circumstances Favor Diplomatic Targets * Information Gaps * Cooperation with Allies * The Move to Hawaii * Support to the Pacific Fleet * Japanese Intentions Revealed * Support to Asiatic Fleet * Japanese Strategy * Japanese Navy * Diplomatic Messages * Warning Messages * Reaction * COMINT after the Opening Attack * Conclusion * Appendix A: Naval Messages Intercepted between 5 September and 4 December 1941 * Appendix B: Summary of Diplomatic Messages July-November 1941 * Appendix C: Highlights from COM-14 Daily COMINT Summary * Notes * Abbreviations Used * Notes on Sources Bibliography West Wind Clear: Cryptology and the Winds Message Controversy - A Documentary History: Chapter 1: Background: Interwar U.S. - Japan Relations and Cryptology * United States-Japan Relations, 1919-1940 * (Japanese Diplomatic and Naval Cryptology and American Codebreaking between the Wars) * United States - Japan Relations Worsen, 1940-1941 * Chapter 2: Intercepted Japanese Diplomatic Messages Reveal a Warning System, 19 November-28 November 1941 * The Cryptography of the J-19 System * Japan Fields a New Diplomatic Manual Cryptographic System * The Americans Solve the New Manual System November 19: Japanese Message #2353 - The First Winds Instruction Message * November 19: Japanese Message #2354 - The Second Winds Instruction Message * Chapter 3: The Hunt for the Winds Execute Message, 28 November — 7 December 1941 * The Search Begins — 28 November 1941 * Tokyo Sends More Instructions about Destroying Cryptographic Material * The Hidden Word Message — A Complement to the Winds Messages * Tokyo Sends Even More Instructions, 28 November-6 December * 7 December 1941: The Hidden Word Message Is Sent * 7 December 1941: The Winds Execute Message Is Sent * Chapter 4: The Winds Controversy: Myth and Reality * Captain Laurance Safford — In the Eye of the Controversy * Safford Searches for the Missing Winds Execute Message * Safford's Detailed Claim about the Winds Execute Message — February 1946 * Examining Safford's Version(s) of Events * The Intercept of the Winds Execute Message * Actions Taken in the Aftermath of the Winds Execute Message * Who Saw the Winds Execute Intercept or Translation? * The Matter of Missing or Destroyed Records * Some Observations on Captain Laurance Safford * The Case of Captain Alwin Kramer's Changing Testimony * What the Japanese Said about the Winds Execute Message * What the British and Dutch Radio Monitors Heard * The Winds Controversy Resurfaces — Ralph Briggs' Claim * The Winds Execute: The Final Casting * Afterword: The Winds Message, American Cryptology and History * The Impac

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