Public Key Encryption Reflection

In a few paragraphs, describe 3 new things you have learned about public key encryption. (These may include, but are not restricted to, the mathematics behind the RSA cipher or the Diffie Hellman key exchange, the algorithms for encryption, key exchange, or digital signatures that we studied, approaches to breaking ciphers, etc.) What has built on prior knowledge? What has challenged any previously held ideas? What has been challenging? What are you looking forward to learning more about?