Yahoo has rolled out HTTPS on almost all aspects of its Internet presence as part of its plan to lock the US government spooks out of its networks.
Late last year, it was revealed that the agency was tapping into the cables of the Yahoo and Google and email providers, even those located outside the US.
Yahoo's announcement is supposed to show how far it has gone to keep the spooks out.
According to a statement, Yahoo has mostly dealt with the problem by implementing HTTPS for its services. As of the end of March, data traveling between Yahoo data centres have been fully encrypted.
All searches done within Yahoo and its properties now make use of HTTPS for encryption. Even emails sent between Yahoo Mail and other providers can use HTTPS as long as the other end supports the SMTPTLS protocol.
Yahoo will also roll out a fully encrypted version of its Messenger software in the coming months.
Users are encouraged to ensure that they are using Yahoo's encrypted channels, or manually switch to them by simply using "https" instead of the usual "http" in their browsers when using Yahoo services.