Google wants to reward websites that are more secure.So,google moves to boost search ranking for HTTPS Sites.
Google announced that they are now using SSL/HTTPS as a ranking signal in their Google search algorithm.
HTTPS is a one of the main part of Site Ranking
The company has been testing a method for taking into account whether a site uses HTTPS as part of its search ranking, and officials say it has returned positive results so far. So as of now, the use of a secure connection is one component of a site’s search ranking.
Google said it had begun favoring encrypted sites over the past few months. Up to now, it has been a "lightweight" signal, affecting less than 1% of global searches. But it plans to boost the weighting over time.
As a result of the new information, Google will publish a best-practices guide within the next few weeks to help users not make mistakes when moving to HTTPS.
Need to Concern when switching from HTTP to HTTPS
You need to take the proper steps to ensure your traffic doesn’t suffer.
Also,make sure to communicate to Google that you moved your site from HTTP to HTTPS.
Some Google Advice for going HTTPS
1)Decide the kind of certificate you need: single, multi-domain, or wildcard certificate
2)Use 2048-bit key certificates
3)Use relative URLs for resources that reside on the same secure domain
4)Use protocol relative URLs for all other domains
5)Check out our Site move article for more guidelines on how to change your website’s address
6)Don’t block your HTTPS site from crawling using robots.txt
7)Allow indexing of your pages by search engines where possible. Avoid the noindex robots meta tag.
Also,Google has updated the Google Webmaster Tools to better handle HTTPS sites
And google has updated the Video about HTTPS
The Video presentation was give by Pierre Far from the Google Webmaster team and Ilya Grigorik from the Google Developer team.
Check the Video for more understanding for HTTPS Everywhere.