For those who need to deal with cryptography, ciphers, digital signatures ... so practically for everyone, the National Security Agency provides help and insight!
They have a flash and a 'text only' version for America's Future Codemakers and -breakers. For cryptographic history and basic knowledge on how to apply cryptography see "Codes and Ciphers". Once when you are there do not miss the CVs of your fellow CryptoKids™. I like T. Top™ he wears just my kind of Hawaii shirt.
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