Scratch Advanced – Week 4 – Cryptography the Caesar Cipther

This week we created on of the most famous ciphers the Caesar Cipher. This cipher is named after the Roman emperor Julius Caesar.

The Caesar cipher works by shifting each letter of the alphabet by a specific number.

In the example of the Caesar Cipher below the letters in the PlainText alphabet have been shifted by three places.

Cipher shift

The letter a becomes D, the letter g becomes J and so on.

Using a Caesar Cipher with an offset of three the words Coder Dojo Athenry would become FRGHU GRMR DWKHQUB

The notes for this session on how to create a Caesar Cipher using Scratch are here: Scratch Encryption project Ceasar Cipher

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