AES
Standard
https://nvlpubs.nist.gov/nistpubs/fips/nist.fips.197.pdf
Mathematik im GF(8):
https://crypto.stackexchange.com/questions/14902/understanding-multiplication-in-the-aes-specification
Galois Field GF(2^m) Calculator
Mix-Columns:
https://en.wikipedia.org/wiki/Rijndael_MixColumns
https://www.youtube.com/watch?v=dRYHSf5A4lw