LiveCode Forums.

Brian Innes, Bancroft, 1966.
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My Granny gave me this book when I was 9 (1971) and it is still one of my favourites.

My favourite bit has always been pages 40-46:

Code, Ciphers. Secret Ink.

As I love imposing my "childhood traumas" on other people I have my summer school LiveCoders starting
today on a relatively simple coding stack:
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Tomorrow we'll have a go at a Vigenère cipher:

https://en.wikipedia.org/wiki/Vigen%C3%A8re_cipher

The ENCODE button has MY code in it [the children did NOT get that], but the DECODE button is empty at the moment.

The children were given a print out:
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and the FUNCTIONALITY of the encoding was demonstrated by performing an encode with a paper and pencil.

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I am probably going senile as I have no memory of ever having seen
put the number of items before.

Oddly enough, this children's book, is on a counter-intelligence reading list:

https://www.hanford.gov/files.cfm/readlist.pdf

in the section for World War II.

Oh, "sugar", a 14 year old girl put me straight when I was using contains instead of = for decoding.
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Experts will see periodicity in this sort of code relatively quickly.

[Well, my Mum, an ex-coder cracker, at 92 took 30 minutes to see the periodicity,
and a further hour with a pencil and paper to crack it.]

However, if one sets this up with 5 or 6 levels of codewords . . .

It certainly beats the Cr . . . . out of Conan Doyle's dancing men:
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Beastly homework: how to deal with this in LiveCode:

i.e. DO NOT recreate this in a scrolling list field.
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Probably NOT a case of 'Roll Over Beethoven', but quite possibly a case of 'Roll Over Twenty-Six.'