(Interesting) To me the most interesting part of the lecture was the fact that Rijndael was able to use 128, 192, or 256-bit encryption. I had not considered this so far in our study of encryption systems, but versatility is definitely important in today's technology. This versatility would allow for an adjustable balance between speed and security of a cryptosystem. The strongest security system is useless if it takes way too long to encrypt or decrypt a message.
(Difficult)
The key schedule was the toughest part of the lecture to understand. It is hard to try to visualize the computations involved in finding the round keys based on the original key.
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