Codes and Ciphers

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There are many different types of codes and ciphers. A code is a system where a symbol, picture, or group of letters represents a specific alphabetical letter or word. A cipher is where a message is made by substituting one symbol for a letter.

Some common codes that have been used by spies:
  • American Sign Language
  • Morse Code
  • Navajo and other unwritten ancient languages
  • Picture codes
Common ciphers:
  • Alphabet ciphers
  • Math based ciphers
  • Transposing or substituting letters

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