http://www.moserware.com/2009/09/stick-figure-guide-to-advanced.html
https://kavaliro.com/wp-content/uploads/2014/03/AES.pdf
https://en.wikipedia.org/wiki/Rijndael_S-box
http://csrc.nist.gov/archive/aes/rijndael/Rijndael-ammended.pdf
http://pi.math.cornell.edu/~morris/135/timeline.html