Three years ago only 15 percent of websites worldwide used a valid SSL (secure socket layer) certificate authority. In April 2018 that figure has jumped to 50 percent according to W3Tech’s data. The remaining sites either don’t have a certificate or have one that is not recognized by a major browser like Chrome or Firefox.
The reason for the sharp rise in SSL adoption is simple. In 2014, Google’s search engine started giving “https” sites a boost in their ranking algorithm.
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