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Purple Code
In the history of cryptography, the "System 97 Typewriter for European Characters" (九七式欧文印字機) 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. The machine was an electromechanical device that used stepping-switches to encrypt the most sensitive diplomatic traffic. All messages were written in the 26-letter English alphabet, which was commonly used for telegraphy. Any Japanese text had to be transliterated or coded. The 26-letters were separated using a plug board into two groups, of six and twenty letters respectively. The letters in the sixes group were scrambled using a 6 × 25 substitution table, while letters in the twenties group were more thoroughly scrambled using three successive 20 × 25 substitution tables. The cipher codenamed "Purple" replaced the Type A Red machine previously used by the Japanese Foreign Office. The s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Purple Cipher Machine Analog Bw Photo NCM
Purple is any of a variety of colors with hue between red and blue. In the RGB color model used in computer and television screens, purples are produced by mixing red and blue light. In the RYB color model historically used by painters, purples are created with a combination of red and blue pigments. In the CMYK color model used in printing, purples are made by combining magenta pigment with either cyan pigment, black pigment, or both. Purple has long been associated with royalty, originally because Tyrian purple dye, made from the mucus secretion of a species of snail, was extremely expensive in antiquity. Purple was the color worn by Roman magistrates; it became the imperial color worn by the rulers of the Byzantine Empire and the Holy Roman Empire, and later by Roman Catholic bishops. Similarly in Japan, the color is traditionally associated with the emperor and aristocracy. According to contemporary surveys in Europe and the United States, purple is the color most oft ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Teiji Takagi
Teiji Takagi (高木 貞治 ''Takagi Teiji'', April 21, 1875 – February 28, 1960) was a Japanese mathematician, best known for proving the Takagi existence theorem in class field theory. The Blancmange curve, the graph of a nowhere-differentiable but uniformly continuous function, is also called the Takagi curve after his work on it. Biography He was born in the rural area of the Gifu Prefecture, Japan. He began learning mathematics in middle school, reading texts in English since none were available in Japanese. After attending a high school for gifted students, he went on to the Imperial University (later Tokyo Imperial University), at that time the only university in Japan before the Imperial University System was established on June 18, 1897. There he learned mathematics from such European classic texts as Salmon's ''Algebra'' and Weber's ''Lehrbuch der Algebra''. Aided by Hilbert, he then studied at Göttingen. Aside from his work in algebraic number theory he wrote a g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kana
The term may refer to a number of syllabaries used to write Japanese phonological units, morae. Such syllabaries include (1) the original kana, or , which were Chinese characters (kanji) used phonetically to transcribe Japanese, the most prominent magana system being ; the two descendants of man'yōgana, (2) , and (3) . There are also , which are historical variants of the now-standard hiragana. In current usage, 'kana' can simply mean ''hiragana'' and ''katakana''. Katakana, with a few additions, are also used to write Ainu. A number of systems exist to write the Ryūkyūan languages, in particular Okinawan, in hiragana. Taiwanese kana were used in Taiwanese Hokkien as glosses ( ruby text or ''furigana'') for Chinese characters in Taiwan when it was under Japanese rule. Each kana character (syllabogram) corresponds to one sound or whole syllable in the Japanese language, unlike kanji regular script, which corresponds to a meaning ( logogram). Apart from the five vo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Japanese Imperial Year
The , colloquially known as the or "national calendar year" is a unique calendar system in Japan. It is based on the legendary foundation of Japan by Emperor Jimmu in 660 BC. ''Kōki'' emphasizes the long history of Japan and the Imperial dynasty. History ''Kōki'' dating was used as early as 1872, shortly after Japan adopted the Gregorian calendar system, and was popular during the life of the Meiji Constitution (1890–1947). The Summer Olympics and Tokyo Expo were planned as anniversary events in 1940 (''Kōki 2600''); but the international games were not held because of the Second Sino-Japanese War. The Imperial Japanese Army (IJA, from 1927) and Imperial Japanese Navy (IJN, from 1929) used the ''Kōki'' system for identification. For example many Japanese names circa World War II use imperial years: * The IJA's Type 92 battalion gun was called "ninety-two" because its design was completed in 1932, and the 2592nd year since the first Emperor of Japan was 1932 (''Kō ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plug-board
A plugboard or control panel (the term used depends on the application area) is an array of jacks or sockets (often called hubs) into which patch cords can be inserted to complete an electrical circuit. Control panels are sometimes used to direct the operation of unit record equipment, cipher machines, and early computers. Unit record equipment Main article: Unit record equipment The earliest machines were hardwired for specific applications. Control panels were introduced in 1906 for the Hollerith Type 1 Tabulatorphoto of Type 3 with built-in control panel here. Removable control panels were introduced with the Hollerith ( IBM) type 3-S tabulator in the 1920s. Applications then could be wired on separate control panels, and inserted into tabulators as needed. Removable control panels came to be used in all unit record machines where the machines use for different applications required rewiring. IBM removable control panels ranged in size from 6 1/4" by 10 3/4" (for ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kryha
In the history of cryptography, the Kryha machine was a device for encryption and decryption, appearing in the early 1920s and used until the 1950s. The machine was the invention of Alexander von Kryha (born 31.10.1891 in Charkow, Russian Empire, committed suicide in Baden-Baden in 1955). During the Second World War, Kryha worked as an officer for the German Wehrmacht. There were several versions; the standard Kryha machine weighed around five kilograms, and was totally mechanical. A scaled down pocket version was introduced later on, termed the "Lilliput" model. There was also a more bulky electrical version. The machine was used for a time by the German Diplomatic Corps, and was adopted by Marconi in England. Operation The machine consisted of two concentric rings each containing an alphabet. The inner alphabet was stepped a variable number of places by pushing a lever. In operation, the user would encrypt by finding the plaintext letter on one ring (usually the outer ri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kazuo Tanabe
Kazuo (カズオ, かずお) is a masculine Japanese given name. Possible spellings It has several written forms, and the meaning depends on the characters used (usually kanji, but sometimes hiragana). Common forms include: * 一雄: first son, first in leadership/excellence * 一夫: first son * 一男: first man/male * 和夫: harmonious/peaceful man * 和男: harmonious/peaceful man * かずお (hiragana) * カズオ (katakana) People with the name *, Japanese sport wrestler * Kazuo Aoki, Japanese government minister during the Second Sino-Japanese War, and into World War II *, Japanese shogi player * Kazuo Chiba (born 1940), aikido * Kazuo Harada (died 1998), anime producer, audio director, and sound effects director * Kazuo Hirai (平井一夫, born 1964), President/CEO of Sony Computer * Kazuo Endo, Kobe earthquake survivor * Kazuo Hashimoto, late Japanese inventor of Caller ID and the telephone answering machine, including the ansafone. *, Japanese actor and voice acto ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
London Naval Treaty
The London Naval Treaty, officially the Treaty for the Limitation and Reduction of Naval Armament, was an agreement between the United Kingdom, Japan, France, Italy, and the United States that was signed on 22 April 1930. Seeking to address issues not covered in the 1922 Washington Naval Treaty, which had created tonnage limits for each nation's surface warships, the new agreement regulated submarine warfare, further controlled cruisers and destroyers, and limited naval shipbuilding. Ratifications were exchanged in London on 27 October 1930, and the treaty went into effect on the same day, but it was largely ineffective. The treaty was registered in '' League of Nations Treaty Series'' on 6 February 1931. Conference The signing of the treaty remains inextricably intertwined with the ongoing negotiations, which began before the official start of the London Naval Conference of 1930, evolved throughout the progress of the official conference schedule, and continued for years ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Black Chamber
The Black Chamber (1919–1929), also known as the Cipher Bureau, was the United States' first peacetime cryptanalytic organization, and a forerunner of the National Security Agency. The only prior codes and cypher organizations maintained by the US government had been some intermittent, and always abandoned, attempts by Armed Forces branches prior to World War I. History Headed by Herbert O. Yardley (1889–1958), the Black Chamber was founded in May 1919 following World War I. Yardley had commanded the U.S. Army cryptographic section of Military Intelligence (MI-8) during World War I. MI-8 was disbanded after the war. Jointly funded by the Army and the State Department, the Cipher Bureau was disguised as a New York City commercial code company; it actually produced and sold such codes for business use. Its true mission, however, was to break the communications (chiefly diplomatic) of other nations. During the Washington Naval Conference, it aided American negotiators by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Washington Naval Treaty
The Washington Naval Treaty, also known as the Five-Power Treaty, was a treaty signed during 1922 among the major Allies of World War I, which agreed to prevent an arms race by limiting naval construction. It was negotiated at the Washington Naval Conference, held in Washington, D.C., from November 1921 to February 1922, and it was signed by the governments of Great Britain, the United States, France, Italy, and Japan. It limited the construction of battleships, battlecruisers and aircraft carriers by the signatories. The numbers of other categories of warships, including cruisers, destroyers, and submarines, were not limited by the treaty, but those ships were limited to 10,000 tons displacement each. The treaty was concluded on February 6, 1922. Ratifications of that treaty were exchanged in Washington on August 17, 1923, and it was registered in the '' League of Nations Treaty Series'' on April 16, 1924. Later naval arms limitation conferences sought additional limitations ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
