Tor, a privacy tool-maker, plans to create a secure messaging service that encrypts all user communications by default. The service will be bundled with the default Tor package, which includes a variety of programs and services meant to preserve their users’ online anonymity. Those tools are often used by journalists, activists, and other individuals to communicate without fear of surveillance. They also allow their users to anonymously access the so-called dark Web, which plays host to sites like the now-defunct Silk Road marketplace.