Is every part of it steeled against attack from miscreants across the web? Those may seem like questions born from paranoia. But recent revelations from former NSA contractor Edward Snowden have shown us that, in many ways, we’re right to be paranoid.

Many are working to ensure that the software on your laptop is secure. Just this week, Mozilla called for engineers across the globe to audit its open source Firefox web browser, hoping to prove that it hasn’t been compromised by the NSA or anyone else. And you can easily put your faith in an operating system like Linux. It too is open source, with countless eyes constantly looking over its code.