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jefc1111
5 days ago
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Bletchley code breaker Betty Webb dies aged 101
This is a great book and touches on the subject you mention
https://simonsingh.net/books/the-code-book/
hermitcrab
5 days ago
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Having read this book, I set some codes for my son to break. Each code, once broken, told him the location of the next coded message. And they got progressively harder. It was a fun challenge.
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hermitcrab
5 days ago
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The author of this book also runs an excellent weekly maths newsletter/quiz for 11-16 year olds, and it's free:
https://parallel.org.uk/parallelograms
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