Cryptography Explained: The Science of Code

Ever seen the Da Vinci Code? You might be interested in Cryptography! There are lots of different ways to encrypt a message, from early, simple ciphers to the famous Enigma machine. Michael Aranda takes you through a fun and cryptic episode of SciShow, all about codes!
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Sources:
http://www.vectorsite.net/ttcode_04.html#m3
http://www.simonsingh.net/The_Black_Chamber/crackingprinciple.html
http://book.itep.ru/depository/crypto/Cryptography_history.pdf
http://www.cs.trincoll.edu/~crypto/historical/gronsfeld.html
http://www.sans.org/reading-room/whitepapers/vpns/history-encryption-730
http://ftp.stmarys-ca.edu/jsauerbe/m10s11/chapter5.pdf
http://www.turing.org.uk/scrapbook/ww2.html
http://enigma.louisedade.co.uk/howitworks.html
http://www.codesandciphers.org.uk/enigma/example1.htm
http://www.pbs.org/wgbh/nova/military/how-enigma-works.html
http://www.cs.miami.edu/~burt/learning/Csc609.051/notes/02.html