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Type B Cipher Machine

The "System 97 Typewriter for European Characters" (九七式欧文印字機 kyūnana-shiki ōbun injiki) or "Type B Cipher Machine", codenamed Purple by the United States, was an encryption machine used by the Japanese Foreign Office from February 1939 to the end of World War II. It replaced the Type A Red machine encrypt the most sensitive diplomatic traffic.

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Overview

Development of Japanese cipher machines

Design

Weaknesses and cryptanalysis

Impact of Allied decryption

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Type B Cipher Machine

Nodes66
Edges65
Triples27
Avg. degree1.97
Density0.030303
Components1

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Type B Cipher Machine

Top relations

related to Purple · 14
Type B Cipher Machine → Cipher Machine, Eikichi Suzuki, Foreign Affairs, His, In, Japanese, Kazuo Tanabe, Masaji Yamamoto, Purple, The, The Ministry, Type, Typewriter, United States
related to Design · 13
Type B Cipher Machine → An, As, Cipher Machine, Each, II, III, Machine, SIS, The, The Japanese, The Type, Type, US Army

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Important terminology

japanese machine purple used cipher type messages one switch twenties stepping letters sis switches red american sixes navy stage analog

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
Type B Cipher Machinerelated to DesignThe Type0.60section
Type B Cipher Machinerelated to DesignCipher Machine0.60section
Type B Cipher Machinerelated to DesignAs0.60section
Type B Cipher Machinerelated to DesignUS Army0.60section
Type B Cipher Machinerelated to DesignType0.60section
Type B Cipher Machinerelated to DesignMachine0.60section
Type B Cipher Machinerelated to DesignAn0.60section
Type B Cipher Machinerelated to DesignII0.60section
Type B Cipher Machinerelated to DesignIII0.60section
Type B Cipher Machinerelated to DesignEach0.60section
Type B Cipher Machinerelated to DesignThe Japanese0.60section
Type B Cipher Machinerelated to DesignThe0.60section

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