Security Blog
The latest news and insights from Google on security and safety on the Internet
Broadening HSTS to secure more of the Web
27. September 2017
Posted by Ben McIlwain, Google Registry
The security of the Web is of the utmost importance to Google. One of the most powerful tools in the Web security toolbox is ensuring that
connections to websites are encrypted using HTTPS
, which prevents Web traffic from being intercepted, altered, or misdirected in transit. We have taken many actions to make the use of HTTPS more widespread, both within Google and on the larger Internet.
We began in 2010 by
defaulting to HTTPS for Gmail
and starting the transition to encrypted search by default. In 2014, we started encouraging other websites to use HTTPS by
giving secure sites a ranking boost in Google Search
. In 2016, we became a platinum sponsor of
Let’s Encrypt
, a service that provides simple and free SSL certificates. Earlier this year we announced that Chrome will start
displaying warnings on insecure sites
, and we recently introduced
fully managed SSL certificates in App Engine
. And today we’re proud to announce that we are beginning to use another tool in our toolbox, the
HTTPS Strict Transport Security (HSTS) preload list
, in a new and more impactful way.
The HSTS preload list is built in to all major browsers (Chrome, Firefox, Safari, Internet Explorer/Edge, and Opera). It consists of a list of hostnames for which browsers automatically enforce HTTPS-secured connections. For example, gmail.com is on the list, which means that the aforementioned browsers will never make insecure connections to Gmail; if the user types
http://gmail.com
, the browser first changes it to
https://gmail.com
before sending the request. This provides greater security because the browser never loads an http-to-https redirect page, which could be intercepted.
The HSTS preload list can contain individual domains or subdomains and even
top-level domains
(TLDs), which are added through the
HSTS website
. The TLD is the last part of the domain name, e.g., .com, .net, or .org.
Google operates 45 TLDs
, including .google, .how, and .soy. In 2015 we created the first secure TLD when we added .google to the HSTS preload list, and we are now rolling out HSTS for a larger number of our TLDs, starting with .foo and .dev.
The use of TLD-level HSTS allows such namespaces to be secure by default. Registrants receive guaranteed protection for themselves and their users simply by choosing a secure TLD for their website and configuring an SSL certificate, without having to add individual domains or subdomains to the HSTS preload list. Moreover, since it typically takes months between adding a domain name to the list and browser upgrades reaching a majority of users, using an already-secured TLD provides immediate protection rather than eventual protection. Adding an entire TLD to the HSTS preload list is also more efficient, as it secures all domains under that TLD without the overhead of having to include all those domains individually.
We hope to make some of these secure TLDs available for registration soon, and would like to see TLD-wide HSTS become the security standard for new TLDs.
Updated 2017-10-06
: To clear up some confusion in the responses to this post, we are not rolling out HSTS to Google's previously launched open TLDs (.how, .soy, and .みんな).
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