SSL
- Security/Server Side TLS - mozilla.org
https://wiki.mozilla.org/Security/Server_Side_TLS
The goal of this document is to help operational teams with the configuration of TLS on servers. All Mozilla sites and deployment should follow the recommendations below. - SSL Server Test
https://www.ssllabs.com/ssltest/
free online service performs a deep analysis of the configuration of any SSL web server on the public Internet. - The Logjam Attack
https://weakdh.org/
uncovered several weaknesses in how Diffie-Hellman key exchange, step-by-step instructions if you use SSH.