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A typical classified document. Page 13 of a U.S. National Security Agency report on the USS Liberty incident, partially declassified and released to the public in July 2004. The original overall classification of the page, "top secret", and the Special Intelligence code word "umbra", are shown at top and bottom.
The Enigma machine is a cipher device developed and used in the early- to mid-20th century to protect commercial, diplomatic, and military communication. It was employed extensively by Nazi Germany during World War II, in all branches of the German military. The Enigma machine was considered so secure that it was used to encipher the most top ...
Plaque dedicated to Ems Ukraz in Bad Ems.. The Ems Ukaz or Ems Ukase (Russian: Эмсский указ, romanized: Emsskiy ukaz; Ukrainian: Емський указ, romanized: Ems'kyy ukaz), was a secret decree of Emperor Alexander II of Russia issued on 30 May [O.S. 18 May] 1876 banning the use of the Ukrainian language in print except for reprinting old documents.
Nüshu is a writing system created and used exclusively by women which originated in China's remote Jiangyong county, in southern China, most likely around the 9th century. ^ Martin, Douglas (6 October 2004). "Yang Huanyi, Last User of a Secret Code, Dies". The New York Times. Retrieved 25 January 2024.
Document Number Nine (or Document No. 9 ), more properly the Communiqué on the Current State of the Ideological Sphere [1] (also translated as the Briefing on the Current Situation in the Ideological Realm [2] ), is a confidential internal document widely circulated within the Chinese Communist Party (CCP) in 2013 by the General Office of the CCP.
Printer tracking dots. Printer tracking dots, also known as printer steganography, DocuColor tracking dots, yellow dots, secret dots, or a machine identification code ( MIC ), is a digital watermark which many color laser printers and copiers produce on every printed page that identifies the specific device that was used to print the document.
The term Quran code (also known as Code 19) refers to the claim that the Quranic text contains a hidden mathematically complex code. Advocates think that the code represents a mathematical proof of the divine authorship of the Quran, however this claim has not been validated by any independent mathematical or scientific institute.
The Apocryphon of James, also called the Secret Book of James or the Apocryphal Epistle of James, is a Gnostic epistle. [1] [4] It is the second tractate in Codex I of the Nag Hammadi library . [4] [5] The tractate is a Coptic translation of a Greek original, [4] probably written in Egypt , [1] [4] with estimates of the date ranging from c. 100 ...