Free maths resources from me, Craig Barton. I am the creator of mrbartonmaths.com & diagnosticquestions.com. I am also the TES Maths Adviser and the host of the Mr Barton Maths Podcast.
Clear slides desmonstrating these two ciphers. The railfence cipher makes a good starter - put up the first slide on it, let students try to figure out how the cipher works, discuss, ask them to explain the 3 lines example (remove the taxt saying '3 lines').
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