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Secure Computation 

Famous Unsolved Codes and Ciphers

Cipher Machines

Good Guys and Bad Guys - Crypto 

Steganography - Invisible Ink and more 

Encryption  

For Kids

Undercover Science (games, flash)

Break the Code (CIA)

Can you crack a code? (FBI)

Spy Page (FBI)

Hash That - Can You Keep a Secret  

Thunk - Secret Messages for Kids 

Crack Hacker's Safe  

Reenie's Code Cracker 

Elizabethan Spying Game - Crack the Code

Codes, Ciphers, and Secret Messages

The Morse Code Game

Send Coded Messages

Invisible Ink

Crack the Code 

Crack the Cipher - Decoding Nazi Secrets

Tales of the Encrypted

The Secret Language 

The Boy Secret Agent (Australia, tv show)  

For Teachers

Codes and Ciphers (includes overheads)

Jefferson's Cracking the Code (Lewis and Clark)

How to make invisible ink

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