Michael Horrowitz argues how Google knows most of the WiFi Passwords on this planet: They get them for free through Android’s back-up functionality which stores all “user settings” in the cloud. Now it would be foolish to assume that NSA had no access to this data. How important and secure are WiFi passwords anyway you may ask? Well, in some situations you are forced to use the same password for a WiFi connection that also opens other accounts. An example from the academic world is the eduroam network. which allows roaming in universities around the world with, you guessed it, your home universities credentials. I bet that many people have to use their university wide password to access eduroam. If they also backup these settings in the cloud, then NSA has backups of their university accounts, potentially including further private keys stored there.