Google is working to bring the "HTTPS Everywhere" initiative to its ads products.
By June 30, 2015, the vast majority of mobile, video, and desktop display ads served to the Google Display Network, AdMob, and DoubleClick publishers will be encrypted, the company said. Also by June 30, 2015, advertisers using any of Google's buying platforms, including AdWords and DoubleClick, will be able to serve HTTPS-encrypted display ads to all HTTPS-enabled inventory.
By encrypting ads, the advertising industry can help make the internet a little safer for all users. Recently, the Interactive Advertising Bureau (IAB) published a call to action to adopt HTTPS ads, and many industry players are also working to meet HTTPS requirements.
Google has already moved all YouTube ads to HTTPS as of the end of 2014. In addition, search on Google.com is encrypted for a vast majority of users.