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My daughter has been playing on the NSA's web page called CryptoKids but I was wondering if there is anything else out there that is may be more challenging to a nine year old.

Books are good, obviously but it would rather she uses something online. Do you have any suggestions?

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closed as not constructive by B-Con, Ninefingers May 21 '12 at 12:22

As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance.If this question can be reworded to fit the rules in the help center, please edit the question.

Open-ended questions (eg, "Please give recommendations on X") don't really fit the format for this Q/A community. Another community (example) might be a better fit. –  B-Con May 21 '12 at 1:22
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The best cryptography website I've ever seen (excluding this one, of course ;-) is a website created by a brilliant cryptographer named Terry Ritter www.ciphersbyritter.com. It's the most comprehensive collection of cryptographic and related information I've ever seen, especially for beginners. The advanced researcher will find it a valuable resource as well. I hope you and your children will have as much fun reading it as I have. I'm assuming of course that you are really serious about teaching your child the basics of cryptography .

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