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Japanese authors have identified two events that influenced the Japanese army's decision to invite a foreigner to improve their cryptology. The first was an incident during the Siberian Intervention. The Japanese army came into possession of some Soviet diplomatic correspondence, but their cryptanalysts were unable decipher the messages.
A cipher machine developed for Japanese naval attaché ciphers, similar to JADE. It was not used extensively, [5] [6] but Vice Admiral Katsuo Abe, a Japanese representative to the Axis Tripartite Military Commission, passed considerable information about German deployments in CORAL, intelligence "essential for Allied military decision making in the European Theater."
Japanese Navy ORANGE cryptographic device captured by US Navy. In the history of cryptography, 91-shiki ōbun injiki (九一式欧文印字機, "System 91 Typewriter for European Characters") or Angōki Taipu-A (暗号機 タイプA, "Type A Cipher Machine"), codenamed Red by the United States, was a diplomatic cryptographic machine used by the Japanese Foreign Office before and during World ...
Analog of the Japanese Type B Cipher Machine (codenamed Purple) built by the U.S. Army Signal Intelligence Service Purple analog in use. In the history of cryptography, 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 ...
The Japanese Navy Signal Flags are a set of maritime signal flags for conveying messages in the Japanese language. [1] The system generally uses the standard International Signal Flags, assigning both the letter, number and repeater flags to various kana, roughly following Iroha order for the standard letter flags. It also has several unique ...
JADE was the codename given by US codebreakers to a Japanese World War II cipher machine. The Imperial Japanese Navy used the machine for communications from late 1942 until 1944. JADE was similar to another cipher machine, CORAL, with the main difference that JADE was used to encipher messages in katakana using an alphabet of 50 symbols. [1]
The national seals of Japan comprise the following emblems used for the purpose of authentication by the Emperor and government of Japan: . The Government Seal of Japan (also called the Paulownia Seal)
Kōdai-ji Maki-e Sake Ewer with Chrysanthemums and Paulownia Crests in alternating fields, early 17th century, Azuchi–Momoyama period, Metropolitan Museum of Art. Before the Chrysanthemum Seal was used extensively, the Paulownia Seal originally was the private symbol of the Japanese Imperial Family, from as early as the sixteenth century.