Creating a key pair using ssh-keygen and using the generated key pair to secure the HTTPS communication

Creating a private key locally using openssl, creating a certificate request, sending the request to an external certification provider, and using the provided certificate for HTTPS communication

Creating a 4096-bytes or longer self-signed certificate using openssl and using it to secure HTTPS communication

Creating a secret file using /dev/random as a source and using the generated file for HTTPS communication