As Google closes in on its goal to encrypt 100 percent of Internet traffic going to and from its servers, the search giant will shame the owners of external websites into encrypting their traffic as well.

Beginning in January, users of Google's Chrome Web browser will see a conspicuous "not secure" label next to certain websites that use an unencrypted HTTP server. The label will only appear for sites that transmit passwords or process credit card transactions.

As Google points out in a blog post today, a "substantial portion" of Web traffic has already transitioned to HTTPS, and we imagine the portion is even higher for sites that accept passwords and process transactions. That means few users of mainstream sites will see the warnings. If they do, it's an indicator that the site they're browsing isn't keeping up with encryption standards.

But Google plans to go further. Eventually, Chrome will slap an even more alarming "not secure" label on any site that uses HTTP, not just those handling sensitive data. That future label will be red and display the same exclamation mark Chrome currently uses to indicate a critical error with the way a site is displayed.

Google didn't give an exact date for when that will happen, but it offered a clear warning to website owners dragging their feet: "don't wait to get started moving to HTTPS." Google's approach here is similar to its rumored plan to shame phone and tablet manufacturers into into releasing more frequent Android updates for their devices.

As for Google itself, more than two-thirds of Internet traffic going to and from Google servers is encrypted, including 100 percent of Gmail traffic. So it's a safe bet that the Chrome won't be entering the final phase of its "not secure" labeling until Google encrypts all of its own sites.