/etc/nginx/snippets/ssl-params.conf

ssl-params.conf

# from https://cipherli.st/

ssl_protocols TLSv1.2;
ssl_prefer_server_ciphers on;
ssl_ciphers "EECDH+AESGCM:EDH+AESGCM:AES256+EECDH:AES256+EDH";
ssl_ecdh_curve secp384r1;
ssl_session_cache shared:SSL:10m;
ssl_session_tickets off;
ssl_stapling on;
ssl_stapling_verify on;
# use Google DNS
resolver 8.8.8.8 8.8.4.4 valid=300s;
resolver_timeout 5s;

# HSTS header: BE CAREFUL! 
# Uncommenting this setting means that your site needs to support HTTPS in the future (including subdomains), 
# otherwise users who have previously been to your site won't be able to access.
# add_header Strict-Transport-Security "max-age=63072000; includeSubDomains; preload";

add_header X-Frame-Options DENY;
add_header X-Content-Type-Options nosniff;

ssl_dhparam /etc/letsencrypt/dhparam.pem;