Some explanation of the context, and some more solutions, can be found at <a href="https://codegolf.stackexchange.com/q/3766" rel="nofollow">https://codegolf.stackexchange.com/q/3766</a>, including a 176 byte solution in Python.
The rijndael S-box unlike some other ciphers I've read about, does not use "nothing up my sleeve" numbers but uses numbers with specific mathematical properties. I don't think that means anything nefarious was intended but I've always wondered if replacing that with something like "digits of pi starting from a random offset" would be workable?<p>Pardon the ignorance, I know little about crypto.