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Cryptography In Japan
The cipher system that the Uesugi are said to have used is a simple substitution usually known as a Polybius square or "checkerboard." The i-ro-ha alphabet contains forty-eight letters, so a seven-by-seven square is used, with one of the cells left blank. The rows and columns are labeled with a number or a letter. In the table below, the numbers start in the top left, as does the i-ro-ha alphabet. In practice these could start in any corner. : To encipher, find the plaintext letter in the square and replace it with the number of that row and column. So using the square above, kougeki becomes 55 43 53 63 or 55 34 35 36 if the correspondents decided ahead of time on column-row order. The problem of what to do in the case of letters such as "ga," "de," and "pe" that do not appear in the i-ro-ha alphabet is avoided by using the base form of the letter instead – as above where "kougeki" becomes ''koukeki.'' Technically, this is a serious flaw because some messages may have two or mor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Uesugi Clan
The is a Japanese samurai clan which was at its peak one of the most powerful during the Muromachi period, Muromachi and Sengoku periods (14th to 17th centuries).Georges Appert, Appert, Georges. (1888) ''Ancien Japon,'' p. 79./ref> At its height, the clan had three main branches: the Ōgigayatsu, Inukake, and Yamanouchi. Its most well-known member is the warlord Uesugi Kenshin (1530–1578). During the Edo period, the Uesugi were a ''tozama'' or outsider clan, in contrast with the ''fudai'' or insider ''daimyō'' clans which had been hereditary vassals or allies of the Tokugawa clan. History The clan claims descent from the Fujiwara clan, specifically Fujiwara no Yoshikado,Edmond Papinot, Papinot, Jacques Edmond Joseph. (1906). ''Dictionnaire d'histoire et de géographie du Japon''; Papinot, (2003)"Uesugi", ''Nobiliare du Japon'', p. 67 [PDF 71 of 80)/nowiki>]; retrieved 2013-5-11. who was a ''daijō-daijin'' during the 9th century. Uesugi Shigefusa, Kanjūji Shigefusa was a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jan Kowalewski
Lt. Col. Jan Kowalewski (23 October 1892 – 31 October 1965) was a Polish cryptologist, intelligence officer, engineer, journalist, military commander, and creator and first head of the Polish Cipher Bureau. He recruited a large staff of cryptologists who broke Soviet military codes and ciphers during the Polish-Soviet War, enabling Poland to weather the war and achieve victory in the 1920 Battle of Warsaw. Early life Jan Kowalewski was born 1892 in Łódź, Congress Poland, under rule of the Russian Empire. After graduating from a local trade school, between 1909 and 1913 he studied at the University of Liège in Belgium, where he graduated from the faculty of chemistry. World War I He returned to Poland in 1913, only to be mobilized for the Russian Army the following year, at the outbreak of World War I. He fought in various formations on the Belarusian and Romanian fronts as an officer of the Engineering and Signal Corps, and in December 1918 he was allowed to join the P ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
JADE (cypher Machine)
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.https://www.nsa.gov/about/cryptologic-heritage/center-cryptologic-history/pearl-harbor-review/early-japanese/ Early Japanese Systems NSA Center for Cryptologic History According to the NSA, "apparently, the JADE machine did not stand up to heavy usage in the field, and, after an initial high volume of traffic, it was used much less." While CORAL traffic was also low, an important user was a Japanese representative, Vice Admiral Abe, to an Axis war-planning council whose reports coded in CORAL were intercepted and proved vital to Allied planning in the European theater. See also * Type A Cipher Machine ("Red") * Type B Cipher Machine The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
PURPLE
Purple is a color similar in appearance to violet light. In the RYB color model historically used in the arts, purple is a secondary color created by combining red and blue pigments. In the CMYK color model used in modern printing, purple is made by combining magenta pigment with either cyan pigment, black pigment, or both. In the RGB color model used in computer and television screens, purple is created by mixing red and blue light in order to create colors that appear similar to violet light. According to color theory, purple is considered a cool color. Purple has long been associated with royalty, originally because Tyrian purple dye—made from the secretions of sea snails—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 a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Japanese Naval Codes
The vulnerability of Japanese naval codes and ciphers was crucial to the conduct of World War II, and had an important influence on foreign relations between Japan and the west in the years leading up to the war as well. Every Japanese code was eventually broken, and the intelligence gathered made possible such operations as the victorious American ambush of the Japanese Navy at Midway in 1942 (by breaking code JN-25b) and the shooting down of Japanese admiral Isoroku Yamamoto a year later in Operation Vengeance. The Imperial Japanese Navy (IJN) used many codes and ciphers. All of these cryptosystems were known differently by different organizations; the names listed below are those given by Western cryptanalytic operations. Red code The Red Book code was an IJN code book system used in World War I and after. It was called "Red Book" because the American photographs made of it were bound in red covers.Greg Goebel"US Codebreakers In The Shadow Of War" 2018. It should not be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
William Friedmann
William Frederick Friedman (September 24, 1891 – November 2, 1969) was a US Army cryptographer who ran the research division of the Army's Signal Intelligence Service (SIS) in the 1930s, and parts of its follow-on services into the 1950s. In 1940, subordinates of his led by Frank Rowlett broke Japan's PURPLE cipher, thus disclosing Japanese diplomatic secrets before America's entrance into World War II. Early life Friedman was born Wolf Friedman (, ), in Kishinev, Bessarabia, the son of Frederick Friedman, a Jew from Bucharest who worked as a translator and linguist for the Russian Postal Service, and the daughter of a well-to-do wine merchant. Friedman's family left Kishinev in 1892 on account of anti-Semitic persecution, ending up in Pittsburgh, Pennsylvania. Three years later, his first name was changed to William. As a child, Friedman was introduced to cryptography in the short story "The Gold-Bug" by Edgar Allan Poe. He studied at the Michigan Agricultural College ( ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aktiebolaget Cryptograph
(, " stock company") is the Swedish term for "limited company" or "corporation". When used in company names, it is abbreviated as "AB" (in Sweden), "Ab" (in Finland), or, rarely, "A/B" (dated), roughly equivalent to the abbreviations ''Corp.'', ''Ltd.'', and '' PLC''. The state authority responsible for registration of aktiebolag in Sweden is called the Swedish Companies Registration Office. Sweden All ''aktiebolag'' are divided into two categories: private limited companies and public limited companies. The name of a private limited company may not contain the word ''publikt'' ("public") and the name of a public limited company may not contain the word ''privat'' or ''pvt.'' ("private"). Public A public limited company (''publikt aktiebolag'') is legally denoted as "AB (publ.)" in Sweden or "Abp" in Finland. A Swedish public limited company must have a minimum share capital of 500,000 Swedish kronor and its shares can be offered to the public on the stock market. The suff ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Teleprinter
A teleprinter (teletypewriter, teletype or TTY) is an electromechanical device that can be used to send and receive typed messages through various communications channels, in both point-to-point (telecommunications), point-to-point and point-to-multipoint communication, point-to-multipoint configurations. Initially, from 1887 at the earliest, teleprinters were used in telegraphy. Electrical telegraphy had been developed decades earlier in the late 1830s and 1840s, then using simpler Morse key equipment and telegraph operators. The introduction of teleprinters automated much of this work and eventually largely replaced skilled labour, skilled operators versed in Morse code with Data entry clerk, typists and machines communicating faster via Baudot code. With the development of early computers in the 1950s, teleprinters were adapted to allow typed data to be sent to a computer, and responses printed. Some teleprinter models could also be used to create punched tape for Compute ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
One-time Pad
The one-time pad (OTP) is an encryption technique that cannot be Cryptanalysis, cracked in cryptography. It requires the use of a single-use pre-shared key that is larger than or equal to the size of the message being sent. In this technique, a plaintext is paired with a random secret Key (cryptography), key (also referred to as a ''one-time pad''). Then, each bit or character of the plaintext is encrypted by combining it with the corresponding bit or character from the pad using Modular arithmetic, modular addition. The resulting ciphertext is impossible to decrypt or break if the following four conditions are met: # The key must be at least as long as the plaintext. # The key must be True random, truly random. # The key must never be reused in whole or in part. # The key must be kept completely secret by the communicating parties. These requirements make the OTP the only known encryption system that is mathematically proven to be unbreakable under the principles of informat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hara Hisashi
Hara may refer to: Art and entertainment * The Hara, English rock band from Manchester * ''Hara'' (film), a 2014 Indian Kannada-language drama film * ''Hara'' (sculpture), a 1989 artwork by Deborah Butterfield Mythology * Hara (Bible), a Biblical place name * Hara (Hinduism), an early name for Shiva * Harā Bərəzaitī, a legendary mountain in Persian mythology * Hara Huna Kingdom, an ancient Chinese tribe close to Himalayas mentioned in the epic Mahabharata Places * Hara Arena, a 5,500-seat multi-purpose arena in Trotwood, Ohio, United States * Hara Bay, the mouth of the Valgejõgi River in the Gulf of Finland * Hara Castle (原城, Hara jō), a castle in Hizen Province, Japan * Hara, Ethiopia, a town in central Ethiopia * Hara forests, a forest in southern Iran * Hara Island, an island in the Hara Bay off the northern coast of Estonia * Hara, Harju County, a village in Kuuslalu Parish, Harju County, Estonia * Hara, Lääne County, a village in Lääne-Nigula Pari ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Auguste Kerckhoffs
Auguste Kerckhoffs (19 January 1835 – 9 August 1903) was a Dutch linguist and cryptographer in the late 19th century. Biography Kerckhoffs was born in Nuth, the Netherlands, as Jean Guillaume Auguste Victor François Hubert Kerckhoffs, son of Jean Guillaume Kerckhoffs, mayor of the village of Nuth, and Jeanette Elisabeth Lintjens. Kerckhoffs studied at the University of Liège. After a period of teaching in schools in the Netherlands and France, he became a professor of German language at the École des Hautes Études Commerciales (Paris) and the École Arago. Principles He is best known today for his two-part paper published in 1883 in ''Le Journal des Sciences Militaires'' (''Journal of Military Science'') entitled ''La Cryptographie Militaire'' (''Military Cryptography''). These articles surveyed the then state-of-the-art in military cryptography, and made a plea for considerable improvements in French practice. They also included many pieces of practical advice ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vigenère Cipher
The Vigenère cipher () is a method of encryption, encrypting alphabetic text where each letter of the plaintext is encoded with a different Caesar cipher, whose increment is determined by the corresponding letter of another text, the key (cryptography), key. For example, if the plaintext is attacking tonight and the key is oculorhinolaryngology, then *the first letter of the plaintext, a, is shifted by 14 positions in the alphabet (because the first letter of the key, o, is the 14th letter of the alphabet, counting from zero), yielding o; *the second letter, t, is shifted by 2 (because the second letter of the key, c, is the 2nd letter of the alphabet, counting from zero) yielding v; *the third letter, t, is shifted by 20 (u), yielding n, with wrap-around; and so on. It is important to note that traditionally spaces and punctuation are removed prior to encryption and reintroduced afterwards. * In this example the tenth letter of the plaintext t is shifted by 14 position ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
