Tor isn't some magic wand you can wave to get security, but it helps. The core Tor software's job is to conceal your identity from your recipient, and to conceal your recipient and your content from observers on your end. By itself, Tor does not protect the actual communications content once it leaves the Tor network. This can make it useful against some forms of metadata analysis, but this also means Tor is best used in combination with other tools. https://blog.torproject.org/blog/prism-vs-tor