What other interesting examples of codes from history or the modern-day (digital or non-digital) can you find to inspire or support a lesson about encoding and decoding messages?
There are many ways to introduce the encoding and decoding of messages to primary school students. Alberti’s Disk was created in 1467 by Leon Battista Alberti, and was made up of two concentric rings. The outer ring was engraved with the standard alphabet, and the inner ring was engraved with the same alphabet but written out of order. By rotating the inner ring and matching letters across the disk, messages could be enciphered. Students could explore this cipher and compare to the Caesar cipher to understand how different methods have higher complexities of encoding and decoding.
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