| ▲ | jefc1111 2 days ago | |
This is a great book and touches on the subject you mention https://simonsingh.net/books/the-code-book/ | ||
| ▲ | hermitcrab 2 days ago | parent | next [-] | |
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. | ||
| ▲ | hermitcrab 2 days ago | parent | prev [-] | |
The author of this book also runs an excellent weekly maths newsletter/quiz for 11-16 year olds, and it's free: | ||