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Leo Rosen
Leo Rosen was a U.S. cryptanalyst who worked with Frank Rowlett at Signals Intelligence Service (S.I.S.) before the start of World War II on Japanese ciphers. Rowlett found a method to read the messages enciphered on the Japanese PURPLE machine. Rosen deduced correctly the mechanism of the cipher machine, even though the mechanism used by PURPLE, telephone stepping switches, was substantially different from other machines (such as the wired rotor and pinwheel machines). Rosen built a replica of PURPLE which turned out (when a machine was found years later) to use stepping switches similar to those in common use at that time in the U.S. This machine was used to decode the Japanese diplomatic messages, sometimes before the Japanese ambassadors had themselves. Rosen also contributed his engineering talents during and after the war at Arlington Hall, after the S.I.S. became the Army Security Agency, later to become AFSA and finally the present National Security Agency Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 U.S. state, states, a Washington, D.C., federal district, five major unincorporated territories, nine United States Minor Outlying Islands, Minor Outlying Islands, and 326 Indian reservations. The United States is also in Compact of Free Association, free association with three Oceania, Pacific Island Sovereign state, sovereign states: the Federated States of Micronesia, the Marshall Islands, and the Palau, Republic of Palau. It is the world's List of countries and dependencies by area, third-largest country by both land and total area. It shares land borders Canada–United States border, with Canada to its north and Mexico–United States border, with Mexico to its south and has maritime borders with the Bahamas, Cuba, Russia, and other nations. With a population of over 333 million, it is the List of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
WE 206A Stepping Switch Front
In Modern English, ''we'' is a plural, first-person pronoun. Morphology In Standard Modern English, ''we'' has six distinct shapes for five word forms: * ''we'': the nominative (subjective) form * ''us'' and ': the accusative (objective; also called the 'oblique'.) form * ''our:'' the dependent genitive (possessive) form *''ours:'' the independent genitive (possessive) form * ''ourselves'': the reflexive form There is also a distinct determiner ''we'' as in ''we humans aren't perfect'', which some people consider to be just an extended use of the pronoun. History ''We'' has been part of English since Old English, having come from Proto-Germanic *''wejes'', from PIE *''we''-. Similarly, ''us'' was used in Old English as the accusative and dative plural of ''we'', from PIE *''nes''-. The following table shows the old English first-person plural and dual pronouns: By late Middle English the dual form was lost and the dative and accusative had merged. The ''ours'' genitive ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
