Check out this link. http://users.telenet.be/d.rijmenants/en/visualcrypto.htm
This is a cool type of cryptography called visual cryptography. It is unique because it does not require the use of computers to decrypt. It can all be decrypted with the human eye. It was created in 1994 by Moni Naor and Adi Shamir. Can you think of any good application of this kind of cryptography?
Musical cryptology: hiding codes in music by having an aspect of the music itself represent either letters or words.
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