I've been moving with the bodies that move to a different sound

[sovay]

I just taught my niece a simple substitution cipher and within ten minutes she had correctly deciphered a short message I had written to her. I could watch her make the connections, exclaiming as she recognized individual encrypted letters without having to refer to the key. Then she drew a picture at the bottom of the page to make it clear she had not just copied out but understood. Morse code, Playfair, one-time pads, here we come.

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[nodrog]

I may be the only one here who knows what a “one-time pad” is.  Tho’ maybe not.  (Here's a tip:  Use pi.  Pre-arrange how many places in you start.  The Julian date is good; every day the same message would look entirely different!)

Me, I'm all set - I have my "Dick Tracy Secret Code Maker" built by Lawrence Engineering in 1939.

https://sliderules.nl/media/slide_images/Lawrence_Code-Maker_Beich.jpg

(That image printed and scissored would make your own.

LawrenceCodeMakerBoxOpen_Kenneth%20Lewis_med.jpg

-Likewise:  The gift set.)

https://sliderulemuseum.com/Manuals/M102_DickTracySecretCodeMaker_Inst.pdf

I'll tell you what, you can cook up a mess with that thing!

https://www.dcode.fr/slidefair-cipher

[“uncopyrightable” is the longest English word with no repeating letters.]