The History of Cryptography
What is Cryptography?
Code or Cipher?
A secret code replaces words, phrases and sentences with groups of numbers or letters
Ciphers use substitutes or rearrange letters.
OMG (oh my God) and LOL (Laugh out Loud or Lots of Love) are examples of ciphers
Both codes and ciphers need a key to be able to decipher (work out what they mean)
To crack a code or cipher you need to know the rules used to make the code.
You need to know the key!
Make your own Secret Messages
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