Welcome to the next step in your quest!  Unencrypt me!

25MAcOo1+05lXTPgWN+xRatOPrHyiEzKruHGcvuv4Xqn8fS9sbJdg2boh3REXpx7tnrHPmsboTbBmvS10ZmvWAuc8u6dLxHbNC2PRrNe1A1wv1Zpm+45JuMSWvqeBrLaQ9N/4eh6Vrq2CyUqrr31zmH4B0aX/qIIPam6kPPVKdC1o9vhj+Zog7xdKfZ5y+4Jotbuy7iirKCBMdiFNhFrRulMA35/qosdub9eMi/idbEXxwzgjOsgo2THR43KgO6Q

Here are some clues to help you out:

Clue #1

I am a symmetric key encryption algorithm.  I support key sizes of 128, 192, and 256.  I am a substitution cipher that uses a combination of three discrete and invertible layers.  My keys must be in multiples of 32 bits.  My name is derived from the names of my two creators.  What encryption algorithm am I?

Clue #2

Once upon a time, there was a young developer named Ronnie Rovak (no affiliation with this giveaway btw).  As he went for a stroll through Shenzhen, he came upon a small blockchain company where he started writing his first blockchain application.  As he stress tested the security of his application, he exclaimed “This key is too weak.  All the l33t haxors will brute force this!”  So he structured his app and began testing again.  All the CPUs on his servers spiked to 100% and everything slowed to a crawl.  He exclaimed “This key size is too big!”  He went back to work one last time.  Finally he got it right and said “Ahh, this key size is just right.”

Clue #3

What is the exact phrase the doctors said was the source of Ruby’s seizures?