Twenty years after Netscape introduced encryption to web browsers to safeguard the private data of Internet users, roughly two-thirds of web traffic still moves on unprotected channels, according to research by Sandvine, a network equipment provider.

Whether you visit Amazon’s product pages, stream a movie from Netflix or read the tax rules on the Internal Revenue Service’s website, marketers and hackers can snoop on everything you do.

But now, the computer industry and the United States government have embarked on a major, multifront campaign to have basic web encryption — known as HTTPS or TLS encryption — more widely adopted.