At Google I/O earlier this week, +Ilya Grigorik and I talked about how to implement HTTPS on all your sites. We covered a ton of topics like why you need HTTPS, how to deploy it correctly that doesn't impact website performance (we talked about HSTS, session resumption, SPDY, and more), and how to make sure your secure sites get indexed correctly (lots of indexing signals!). Check it out:

Google I/O 2014 - HTTPS Everywhere

We referenced some docs and tools. Here they are to dig into:

https://istlsfastyet.com/ (The answer is a resounding "yes")
https://wiki.mozilla.org/Security/Server_Side_TLS
https://www.ssllabs.com/

and, of course, https://www.google.com/webmasters/tools/
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