Difficult:
I think I understand how the ElGamal Cryptosystem works but I'm not sure. I think I need an example to see it better. I'm not sure why the set of possible ciphertexts isn't the same as the set of possible plaintexts. It seems really similar to RSA but I'm a bit confused about the value of t and r. It seems like both t and r are computed and I'm not sure how you choose some k value but you don't need to send that to whoever your are sending a message to.
Reflective:
I think it's interesting they've created a way of exchanging keys. However it seems that with public key cryptography we wouldn't need to exchange keys. We could use RSA to encrypt a key for AES and then send the encrytped key. The receiver could then decrypt the key with RSA and then the receiver and sender both have a symmetric key.
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