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National Defence Radio Establishment (Sweden)
The National Defence Radio Establishment (, FRA) is a Swedish government agency organised under the Ministry of Defence. The two main tasks of FRA are signals intelligence (SIGINT), and support to government authorities and state-owned companies regarding computer security. The FRA is not allowed to initialize any surveillance on their own, and operates purely on assignment from the Government, the Government Offices, the Armed Forces, the Swedish National Police Board and Swedish Security Service (SÄPO). Decisions and oversight regarding information interception is provided by the Defence Intelligence Court and the Defence Intelligence Commission; additional oversight regarding protection of privacy is provided by the Swedish Data Protection Authority. History Signals Intelligence has existed in Sweden since 1905 when Swedish General Staff and Naval Staff respectively, had departments for signals intelligence and cryptanalysis. These departments succeeded, for instance ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Signals Intelligence Service (Sweden)
The National Defence Radio Establishment (, FRA) is a Government Agencies of Sweden, Swedish government agency organised under the Ministry of Defence (Sweden), Ministry of Defence. The two main tasks of FRA are signals intelligence (SIGINT), and support to government authorities and state-owned companies regarding computer security. The FRA is not allowed to initialize any surveillance on their own, and operates purely on assignment from the Government of Sweden, Government, the Government of Sweden#Government ministries and offices, Government Offices, the Swedish Armed Forces, Armed Forces, the Swedish National Police Board and Swedish Security Service (SÄPO). Decisions and oversight regarding information interception is provided by the Defence Intelligence Court and the Defence Intelligence Commission; additional oversight regarding protection of privacy is provided by the Swedish Data Protection Authority. History Signals Intelligence has existed in Sweden since 1905 w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coat Of Arms
A coat of arms is a heraldry, heraldic communication design, visual design on an escutcheon (heraldry), escutcheon (i.e., shield), surcoat, or tabard (the last two being outer garments), originating in Europe. The coat of arms on an escutcheon forms the central element of the full achievement (heraldry), heraldic achievement, which in its whole consists of a shield, supporters, a crest (heraldry), crest, and a motto. A coat of arms is traditionally unique to the armiger (e.g. an individual person, family, state, organization, school or corporation). The term "coat of arms" itself, describing in modern times just the heraldic design, originates from the description of the entire medieval chainmail "surcoat" garment used in combat or preparation for the latter. Roll of arms, Rolls of arms are collections of many coats of arms, and since the early Modern Age centuries, they have been a source of information for public showing and tracing the membership of a nobility, noble family, a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arne Beurling
Arne Carl-August Beurling (3 February 1905 – 20 November 1986) was a Sweden, Swedish mathematician and professor of mathematics at Uppsala University (1937–1954) and later at the Institute for Advanced Study in Princeton, New Jersey. Beurling worked extensively in harmonic analysis, complex analysis and potential theory. The "Hardy space#Factorization into inner and outer functions (Beurling), Beurling factorization" helped mathematical scientists to understand the Wold decomposition, and inspired further work on the invariant subspaces of linear operators and operator algebras, e.g. Håkan Hedenmalm's factorization theorem for Bergman spaces. He is perhaps most famous for single-handedly decrypting an early version of the German cipher machine Siemens and Halske T52 in a matter of two weeks during 1940, using only pen and paper. This machine's cipher is generally considered to be more complicated than that of the more famous Enigma machine. Beurling's method of decrypting mi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geheimfernschreiber
The Siemens & Halske T52, also known as the Geheimschreiber ("secret teleprinter"), or ''Schlüsselfernschreibmaschine'' (SFM), was a World War II German cipher machine and teleprinter produced by the electrical engineering firm Siemens & Halske. The instrument and its traffic were codenamed ''Sturgeon'' by United Kingdom, British cryptanalysts. While the Enigma machine was generally used by field units, the T52 was an online machine used by Luftwaffe and Kriegsmarine, German Navy units, which could support the heavy machine, teletypewriter and attendant fixed electrical network, circuits. It fulfilled a similar role to the Lorenz cipher machines in the German Army (Wehrmacht), German Army. The British cryptanalysts of Bletchley Park codenamed the German teleprinter ciphers Fish (cryptography), Fish, with individual cipher-systems being given further codenames: just as the T52 was called ''Sturgeon'', the Lorenz machine was codenamed ''Tunny''. Operation The teleprinters of the d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Telephone Network
A telephone network is a telecommunications network that connects telephones, which allows telephone calls between two or more parties, as well as newer features such as fax and internet. The idea was revolutionized in the 1920s, as more and more people purchased telephones and used them to communicate news, ideas, and personal information. During the 1990s, it was further revolutionized by the advent of computers and other sophisticated communication devices, and with the use of dial-up internet. There are a number of different types of telephone network: * A landline network where the telephones must be directly wired into a single telephone exchange. This is known as the public switched telephone network or PSTN. * A wireless network where the telephones are mobile and can move around anywhere within the coverage area. * A private network where a closed group of telephones are connected primarily to each other and use a gateway to reach the outside world. This is usually us ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wehrmacht
The ''Wehrmacht'' (, ) were the unified armed forces of Nazi Germany from 1935 to 1945. It consisted of the German Army (1935–1945), ''Heer'' (army), the ''Kriegsmarine'' (navy) and the ''Luftwaffe'' (air force). The designation "''Wehrmacht''" replaced the previously used term (''Reich Defence'') and was the manifestation of the Nazi regime's efforts to German rearmament, rearm Germany to a greater extent than the Treaty of Versailles permitted. After the Adolf Hitler's rise to power, Nazi rise to power in 1933, one of Adolf Hitler's most overt and bellicose moves was to establish the ''Wehrmacht'', a modern offensively-capable armed force, fulfilling the Nazi regime's long-term goals of regaining lost territory as well as gaining new territory and dominating its neighbours. This required the reinstatement of conscription and massive investment and Military budget, defence spending on the arms industry. The ''Wehrmacht'' formed the heart of Germany's politico-military po ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Defence Staff (Sweden)
The Defence Staff (, Fst) is the Supreme Commander of the Swedish Armed Forces' staff body and command resource for military strategic command, mission dialogue and reporting to the Government of Sweden, Swedish government, as well as being responsible for the war organization's Military capability, capability, availability and combat readiness. The latter with the support of the service branch commanders and the service branch staffs. The Defence Staff was originally established in 1937 and was commanded by the Chief of the Defence Staff (Sweden), Chief of the Defence Staff. Initially the tasks of the Defence Staff was limited to the overall military strategic and operational issues as well as to the central operational command of army forces. In 1961 a central operational command was added for the navy and air force. The Defence Staff ceased in connection with the reorganization of the Swedish Armed Forces in 1994 and with the creation of the Swedish Armed Forces Headquarters. B ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
OGPU
The Joint State Political Directorate ( rus, Объединённое государственное политическое управление, p=ɐbjɪdʲɪˈnʲɵn(ː)əjə ɡəsʊˈdarstvʲɪn(ː)əjə pəlʲɪˈtʲitɕɪskəjə ʊprɐˈvlʲenʲɪje), abbreviated as OGPU (), was the secret police of the Soviet Union from November 1923 to July 1934, succeeding the State Political Directorate (GPU). Responsible to the Council of People's Commissars, the OGPU was headed by Felix Dzerzhinsky until 1926, then by Vyacheslav Menzhinsky until replaced by the Main Directorate of State Security (GUGB) within the People's Commissariat for Internal Affairs (NKVD). The OGPU played an important role in the Soviet Union's forced collectivization of agriculture under the leadership of Joseph Stalin, crushing resistance and deporting millions of peasants to the growing network of Gulag forced labor camps. The OGPU operated both inside and outside the country, persecuting political cri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Swedish Navy
The Swedish Navy () is the maritime service branch of the Swedish Armed Forces. It is composed of surface and submarine naval units – the Fleet (), formally sometimes referred to as the Royal Navy () – as well as marine units, the Amphibious Corps (). Founded under King Gustav Vasa in 1522, the Swedish navy is one of the oldest continuously serving navies in the world, celebrating its 500th anniversary in 2022. History Early Swedish kings ( 9th–14th centuries) organised a Swedish Navy along the coastline through . This involved combined rowing and sailing ships (without artillery). This system became obsolete with the development of society and changes in military technology. No later than in the 14th century, the duty to serve in was replaced by a tax. In 1427, when Sweden was part of the Kalmar Union (with Denmark and Norway), Swedish warships did however participate in the naval battle of Öresund against the Hanseatic League. It is unclear how this force was ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
World War I
World War I or the First World War (28 July 1914 – 11 November 1918), also known as the Great War, was a World war, global conflict between two coalitions: the Allies of World War I, Allies (or Entente) and the Central Powers. Fighting took place mainly in European theatre of World War I, Europe and the Middle Eastern theatre of World War I, Middle East, as well as in parts of African theatre of World War I, Africa and the Asian and Pacific theatre of World War I, Asia-Pacific, and in Europe was characterised by trench warfare; the widespread use of Artillery of World War I, artillery, machine guns, and Chemical weapons in World War I, chemical weapons (gas); and the introductions of Tanks in World War I, tanks and Aviation in World War I, aircraft. World War I was one of the List of wars by death toll, deadliest conflicts in history, resulting in an estimated World War I casualties, 10 million military dead and more than 20 million wounded, plus some 10 million civilian de ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cipher
In cryptography, a cipher (or cypher) is an algorithm for performing encryption or decryption—a series of well-defined steps that can be followed as a procedure. An alternative, less common term is ''encipherment''. To encipher or encode is to convert information into cipher or code. In common parlance, "cipher" is synonymous with "code (cryptography), code", as they are both a set of steps that encrypt a message; however, the concepts are distinct in cryptography, especially classical cryptography. Codes generally substitute different length strings of characters in the output, while ciphers generally substitute the same number of characters as are input. A code maps one meaning with another. Words and phrases can be coded as letters or numbers. Codes typically have direct meaning from input to key. Codes primarily function to save time. Ciphers are algorithmic. The given input must follow the cipher's process to be solved. Ciphers are commonly used to encrypt written info ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cryptanalysis
Cryptanalysis (from the Greek ''kryptós'', "hidden", and ''analýein'', "to analyze") refers to the process of analyzing information systems in order to understand hidden aspects of the systems. Cryptanalysis is used to breach cryptographic security systems and gain access to the contents of encrypted messages, even if the cryptographic key is unknown. In addition to mathematical analysis of cryptographic algorithms, cryptanalysis includes the study of side-channel attacks that do not target weaknesses in the cryptographic algorithms themselves, but instead exploit weaknesses in their implementation. Even though the goal has been the same, the methods and techniques of cryptanalysis have changed drastically through the history of cryptography, adapting to increasing cryptographic complexity, ranging from the pen-and-paper methods of the past, through machines like the British Bombes and Colossus computers at Bletchley Park in World War II, to the mathematically advanced ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
