Rijndael has a pretty involved algorithm, but I felt like I understood the encryption algorithm well enough. I think the most difficult part to understand was certain aspects of the decryption algorithm, and how to invert some of the processes from the encyption algorithm.
I was glad to see that the authors mentioned others algorithms that were submitted as replacement standards for data encryption. I would be interested to look them up and see how the algorithms work. I also found it interesting that Rijndael is vulnerable to certain attacks up to six rounds, but that any amount greater than seven has no known attacks. Adding rounds to the encryption seems simple, but apparently adds a lot security to the system.
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