subtractive system

subtractive system
криптосистема, выполняющая шифрование вычитанием ключа из открытого текста (а расшифрование - сложением шифротекста с ключом)

Англо-русский словарь по компьютерной безопасности. . 2011.

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  • Subtractive notation — is an early form of positional notation used with Roman numerals as a shorthand to replace four or five characters in a numeral representing a number with usually just two characters. Using subtractive notation the numeral VIIII becomes simply IX …   Wikipedia

  • Subtractive color — mixing An 1877 color photo by Louis Ducos du Hauron, a French pio …   Wikipedia

  • Numeral system — This article is about different methods of expressing numbers with symbols. For classifying numbers in mathematics, see number system. For how numbers are expressed using words, see number names. Numeral systems by culture Hindu Arabic numerals… …   Wikipedia

  • photoengraving — /foh toh en gray ving/, n. 1. a photographic process of preparing printing plates for letterpress printing. 2. a plate so produced. 3. a print made from it. [1870 75; PHOTO + ENGRAVING] * * * Any of several processes for producing printing plates …   Universalium

  • Complementary color — Complementary colors are pairs of colors that are of “opposite” hue in some color model. The exact hue “complementary” to a given hue depends on the model in question, and perceptually uniform, additive, and subtractive color models, for example …   Wikipedia

  • Electronic paper — Electronic paper, also called e paper, is a display technology designed to mimic the appearance of ordinary ink on paper. Unlike a conventional flat panel display, which uses a backlight to illuminate its pixels, electronic paper reflects light… …   Wikipedia

  • Colorfulness — Original image, with relatively muted colors L*C*h (CIELAB) chroma increased 50% …   Wikipedia

  • photography, technology of — Introduction       equipment, techniques, and processes used in the production of photographs.  The most widely used photographic process is the black and white negative–positive system (Figure 1 >). In the camera the lens projects an image of… …   Universalium

  • Color motion picture film — refers both to unexposed color photographic film in a format suitable for use in a motion picture camera, and to finished motion picture film, ready for use in a projector, which bears images in color. Contents 1 Overview 2 Tinting and hand… …   Wikipedia

  • colour — /kul euhr/, n., adj. v.t., v.i. Chiefly Brit. color. Usage. See or1. * * * I Aspect of any object that may be described in terms of hue, brightness, and saturation. It is associated with the visible wavelengths of electromagnetic radiation, which …   Universalium

  • Serial Attached SCSI — (SAS) is a data transfer technology designed to move data to and from computer storage devices such as hard drives and tape drives. It is a point to point serial protocol that replaces the parallel SCSI bus technology that first appeared in the… …   Wikipedia


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