https://luxsci.com/blog/ssl-versus-tls-whats-the-difference.html
https://en.wikipedia.org/wiki/Forward_secrecy
https://www.ssllabs.com/downloads/SSL_TLS_Deployment_Best_Practices.pdf
https://www.trustworthyinternet.org/ssl-pulse/
SSL/TLS Tests:
https://www.ssllabs.com/ssltest/
https://tls.so/
https://luxsci.com/extranet/tlschecker.html