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This was when the first code was used by Julius Caesar to comunicate messages to his generals. This was done by moving the letter 3 spaces forwands. (A=D, B=E, W=Z, X=A, Z=C, ect.)
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Morse code uses a series of dots and dashes to represent a coded message. This is one of the most famous codes.
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The enigma machine was a machine that varying electrical curcuits to operate. It was used often in World War 2. This was the start of modern codes.
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This was invented by Whitfield Diffie and Martin Hellman. It was based often on number theory.
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In the future there will be codes that constantly change so an old code will be useless even a second later.
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Ager, Simon. "Morse Code." Morse Code. Omniglot, 1998. Web. 19 Mar. 2013.
"Cryptography." Wikipedia. Wikimedia Foundation, 19 Mar. 2013. Web. 19 Mar. 2013.
Enigma machine. Digital image. Wikipedia. N.p., n.d. Web. 20 Mar. 2013. http://en.wikipedia.org/wiki/Cryptography.
Julius-caesar.jpd. Digital image. N.p., n.d. Web.
