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Cifra: métodos manuales

Cifra: métodos manuales

          
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About the Book

Desde hace milenios se ha sentido la necesidad de la comunicación secreta, decir algo a otro sin que los demás se enteren. Oral, escrita o modernamente digital, sea de la forma que sea esa comunicación segura requiere un acuerdo previo entre los corresponsales y un canal de transmisión. En este trabajo nos vamos a centrar en las formas que se han ideado para que un texto pueda ser enviado por un corresponsal a otro de forma que un tercero, aun habiendo interceptado el mensaje, no pueda tener acceso a la información que contiene. En ámbitos militares y diplomáticos esto se está haciendo desde el principio de la escritura, y modernamente se ha incorporado a esta necesidad de seguridad los entornos económicos y empresariales. Se ha incorporado primero la electricidad, luego la electrónica y por último la informática para conseguir unos sistemas en teoría inviolables, pero no todas las comunicaciones necesitan esa seguridad, o simplemente no pueden permitírsela. Los primeros métodos que se emplearon se limitaban a transformar un texto claro en otro, escrito con los mismos medios y sobre los mismos soportes que el inicial; poco a poco se incorporaron sistemas para agilizar la transformación de los textos, y en este punto es donde nos centraremos, en los medios que se usaban antes de la incorporación de la electricidad a los equipos de cifra, e incluso un punto antes, cuando las herramientas de cifra se podían hacer simplemente con papel, lápiz y tijeras.


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Product Details
  • ISBN-13: 9781471765278
  • Publisher: Lulu.com
  • Binding: Paperback
  • Language: Spanish
  • Returnable: N
  • Sub Title: métodos manuales
  • Width: 148 mm
  • ISBN-10: 147176527X
  • Publisher Date: 20 Jan 2022
  • Height: 210 mm
  • No of Pages: 254
  • Spine Width: 15 mm
  • Weight: 340 gr


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