Google is now using HTTPS as a ranking signal. Data analysis shows that HTTPS sites have an advantage over HTTP so this switch will now benefit all companies, confidential information or not. Google says this gives websites a ranking benefit within the overall ranking algorithm.
Google also say they may strengthen the signal because they want all website owners to switch from HTTP to HTTPS to keep everyone safe on the web. You can acquire SSL CERTS from your hosting company or get it straight from a third party eg. Comodo. Some people also believe that having ssl certs or https will slow down your site. From my own experience and also trawling through information on this subject it is a very small reduction in load time if any!