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  1. strangehorizons.com

    There's a secret message hidden here, in this very paragraph. It's not in view, and its source is modern. But the art of hiding messages is an ancient one, known as steganography. ... microfilm was created as a way to store a large amount of information in a very small space. ... reduced to the size of a printed period, then pasted into an ...
  2. before mail, before horses, messages were sent on foot. If you wanted to hide a message, you had two ... microfilm was created as a way to store a large amount of ... A secret message was photographed, reduced to the size of a printed period, and then pasted into an innocuous cover message, magazine, or newspaper. The Americans caught on only ...
    Author:Sabu M. ThampiPublished:2008
  3. apps.dtic.mil

    letter could spell out a secret message. Advances in photography produced microfilm, which was used to transmit messages via carrier pigeon. Further developments in this area improved film and lenses, thus providing the ability to reduce the size of secret messages to that of a printed period.
  4. digital.library.unt.edu

    Microdots developed by the Nazis are essentially microfilm chips created at high magnification (usually over 200X). These microfilm chips are the size of periods on a standard typewriter. These dots could contain pages of information, drawings, etc. The Nazis also employed invisible inks and null ciphers. One of the most noted null cipher
  5. various ways that prevent the detection of hidden messages. Steganography, derived from Greek, literally means "Covered ... are essentially microfilm chips created at high magnification (usually over 200X). These microfilm chips are the size of periods on a standard typewriter. These dots could contain pages of information, drawings, etc. The ...
  6. en.wikipedia.org

    Mark IV microdot camera A doll used by a German spy to smuggle microdot photographs to Nazi Germany until the spy's arrest in 1942. (FBI collection)In 1870 during the Franco-Prussian War, Paris was under siege and messages were sent by carrier pigeon.Parisian photographer René Dagron used microfilm to permit each pigeon to carry a high volume of messages, as pigeons can carry little weight.
  7. Computer-output microfilm (COM) is a form of computer printing technology that prints computergenerated information directly onto microfilm, usually microfiche. The COM recorder can image more than 160 pages per minute. A single COM-generated microfiche can store 270 pages that are 11 x 14 inch.
  8. fojacksonnews.files.wordpress.com

    microfilm quality. 1. Roll microfilm is the most inexpensive and widely used microfilm, 2. Microfiche is a sheet of microfilm usually 6" by 4'', with a series of images arranged in rows and columns and a readable header for manual storage and retrieval., 3. An aperture card is an electronic data processing card with an
  9. sciencedirect.com

    Introduction and Historical Background. Nihad Ahmad Hassan, Rami Hijazi, in Data Hiding Techniques in Windows OS, 2017. Microdots. Microdots are text or images reduced to a very small size (about 1 mm in diameter) to prevent detection by unintended recipients. This method was used widely during World War II. Microdots have often been about the size and shape of a period or the title of a ...
  10. sciencedirect.com

    A small sheet of plastic film that has a large number of pages of printed matter that have been shrunk to fit onto the dimensions of the film. Microfiche sheets are read using special machines that magnify their image. Microfilm. The process and product of photographing records and shrinking them to a much-reduced size for more space-efficient ...
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