Unit 3


Another example of codes from history is Alberti’s disk. This disk consisted of two concentric circles; the outer circle was static and made up of the ordered alphabet while the inner circle was able to spin and contained the letters of the alphabet in random order. In 1467, this disk was used to create both simple and extremely complex messages that were very secure. Only someone with the disk could decipher the encrypted message.

A thought provoking learning experience could be to re-create Alberti’s disk and use it in the classroom to encrypt and decrypt messages.

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