Do you like codes and ciphers? Do you write your friends notes in "invisible" ink? Do you ever wonder whether the E-mail you send to your friends is really safe from prying eyes? Today's website, CryptoKids™ from the National Security Agency/Central Security Service, is for you.
Join Crypto Cat™, Decipher Dog™, and all of their friends to learn about cryptology, the science of making and breaking codes. (Itinerant Cryptographer is especially good at a subset of cryptology known as cryptanalysis, which is trying to break into codes without knowing the special "key" behind how they were made.)
Learn to create codes, make ciphers, and solve some brainteasers, cryptograms, and something I'd never heard of before called a Yardleygram.