Encrypting information between client and server

[WeLoveGoodHouse]

I am looking for information about encryption protocols we can employ to keep information secure between client (plugin) and server. I see that there are methods for RSA encrypt and decrypt.

In the docs it says that we encrypt with the RSA public key but I am having trouble finding information on how to create the RSA public key. Is there information on that?

I see that we have methods for POST and GET. My understanding is that these use HTTP protocol. Is there a way to use HTTPS protocol?

Thanks.