Google is moving all of its online services to use strong HTTPS encryption. The search engine giant has already moved its YouTube ads to HTTPS as of the end of last year. The move could be part of Google’s efforts to encrypt everything under a wider “HTTPS Everywhere” initiative. According to the company, the advertising industry could help make the Internet safer for all online users by encrypting ads. In 2015, the IABB says the ad industry “needs to finish catching up” and adopt HTTPS.
Source: https://thehackernews.com/2015/04/encrypted-google-ad-service.html

