ssl_protocols TLSv1.2;
ssl_ciphers "ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-CHACHA20-POLY1305-D:ECDHE-RSA-CHACHA20-POLY1305-D:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256”;
ssl_prefer_server_ciphers on;
ssl_ecdh_curve brainpoolP512r1:sect571r1:secp521r1:secp384r1;

ssl_session_cache shared:SSL:10m;
ssl_session_timeout 5m;
ssl_session_tickets off;