Computing half-term 1

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Year 9 Computer Science
- ciphers
  - Transposition
    - Transposition cipher is a method of encryption by which the positions held by units of plain text .
    - For example : "Lets go to the shops" would be "spohs eht ot og steL "
  - Substitution
    - A Substitution (Shift) cipher is where all the letters shift by a certain amount to become a different letter
    - Key is the amount of times the letters are shifted
    - Juleus Ceaser created the Ceaser cipher where the letters are shifted by a key of 3 .
  - Plain text is just normal readable text .
  - Cipher text is a piece of encrypted text
- Python
  - Data types
    - A real/float is a number with a decimal
    - A string is any character that does no actions
    - An integer is a whole number
    - A Boolean is a variable of true and false values in python .
  - A variable is a storage area in the memory of a computer given a label . The contents of the variable can be changed throughout a program
  - print(" ? ") does what it says inside the code when you run it .
  - input ("What do you want?") . This asks the person a question and the person needs to answer it.
  - ...
  - if,elif and else
  - Loops
    - while
    - for
      - Range
Substitution
- A Substitution (Shift) cipher is where all the letters shift by a certain amount to become a different letter
- Key is the amount of times the letters are shifted
- Juleus Ceaser created the Ceaser cipher where the letters are shifted by a key of 3 .

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