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Secure ciphers must guarantee forward secrecy, and must mitigate all known critical attacks. As of 2018, using these ciphers allows you to obtain grade A on https://www.ssllabs.com. For A+, you must also enable HTTP Strict Transport Security (HSTS) by sending a suitable header field in replies.
Note that obsolete ciphers must be disabled to reliably prevent protocol downgrade attacks.
The Ciphers list is read from the setting
can be controlled using set_setting/2 and other predicates from
BEWARE: This list must be changed when attacks on these ciphers become known! Keep an eye on this setting and adapt it as necessary in the future.