Editor’s note: This article is the first in a series focusing on the best encrypted apps and services available. Content has been provided by an anonymous security and privacy professional. Readers are encouraged to confirm this information on their own.

Who is this for?

Anyone who needs to communicate electronically. Sending an email or an SMS may feel like the electronic equivalent of sending a letter, but it’s actually more like a postcard. Seriously. It was recently reported in the Wall Street Journal that Gmail gives plaintext emails to third party developers. That is to say, humans not even within Google can and do read Gmail users’ emails, with no technological or even legal barrier, whatsoever. So if you use email and SMS for anything you wouldn’t put on a postcard (and I think that that’s pretty much all of us), you need encryption.

What is encrypted communication?