Computing Topic 3-Data Representation

  • Created by: Chloe200
  • Created on: 02-01-18 17:08
Natural Number
A positive whole number including zero
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Rational Number
Any number can be expressed as a fraction or ratio of integers
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Irrational Number
Any number that can't be expressed as a fraction or ratio
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Real Number
Any positive or negative number with or without a fractional part
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Ordinal Number
A number used to identify position relative to other numbers
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A single binary digit, either zero or one
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A group of 8 bits, used to represent a single character
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Unsigned Binary
Binary numbers that represents positive numbers only
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Two's Complement
A system for representing negative number
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A number system that uses base 16-numbers 0 to 9 and letters A to F
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Character Code
A binary representation of a particular character (letter, number, punctuation or special character)
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A standard 7 or 8 bit binary coding system for characters and numbers
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A standard 32-bit binary coding system that superseded ASCII
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Parity Bit
A method of checking binary codes by counting the 1s and 0s in the code
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Majority Voting
A method of checking for errors by producing the same data several times and checking it is the same each time
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Check Digit
A digit added to the end of binary data to check the data is accurate
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Bit-mapped graphic
An image made up of individual pixels
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An individual pixel element
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Number of pixels per cm/inch. Density of pixels
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Colour Depth
The number of bits or bytes allocated to represent colour of a pixel
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The process of reducing the number of bits required to represent data
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Run-length encoding
A method of compression by eliminating repeated data
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The process of turning plaintext into scrambled ciphertext, which can only be understood if it is decrypted
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The process of deciphering encrypted data
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Data in human-readable form
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Data that has been encrypted
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Caesar Cipher
A substitution cipher where one character of plaintext is substituted for another
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Vernam Cipher
A mthod of of encryption that uses a key to create ciphertext that is mathematically impossible to decrpyt without the key
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One-time pad
A key that is used only once to encrypt and decrypt a message and is then discarded
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Other cards in this set

Card 2


Rational Number


Any number can be expressed as a fraction or ratio of integers

Card 3


Irrational Number


Preview of the front of card 3

Card 4


Real Number


Preview of the front of card 4

Card 5


Ordinal Number


Preview of the front of card 5
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