Google Encrypts Connections Between its Servers
Now it has made two announcements. Firstly, use of HTTPS is now mandatory for all Gmail users all of the time, and secondly, HTTPS is also used between its data centers. On the first, Nicolas Lidzborski, Gmail security engineering lead explained in a blog, "Today's change means that no one can listen in on your messages as they go back and forth between you and Gmail’s servers—no matter if you're using public WiFi or logging in from your computer, phone or tablet.