Does this imply the client doing the encryption? I.e. the client creates a key pair and sends the public key to the server? It sounds good but the challenge, a

Does this imply the client doing the encryption? I.e. the client creates a key pair and sends the public key to the server? It sounds good but the challenge, as always, is the infrastructure. I think it would be great if I had a single personal private key from which I could issue chained keys for each domain where I have an account. But imagine managing this across desktops, browsers, phones, game systems, etc. ...