I'm wondering after reading the article if I should be worried with the app I wrote, http://www.selinked.com to learn nodejs and mongodb. It's a dead drop sort of thing with chatting, all encrypted on the frontend so nothing get's transmitted in the clear. It's not open source per se but all of the magic happens on the front end so you can see the code. Backend just manages sockets and stores encrypted data. When writing it it did cross mind that governments could have an issue with it but after seeing that I was not the first one to do this I figured I was ok. Now I'm starting to reconsider this position, I already get enough shit at the airports due to the fact I'm a green card holder and treated as a third rate citizen, don't need more.
This is similar to an app I wrote for fun to learn some nodejs, http://www.selinked.com. I think it's pretty secure but I am no encryption expert. Main difference is that I store nothing but the encrypted messages and for the chat and group chat nothing at all. You can also change the type of encryption it uses, all js browser side. Group chat and chat are half baked, there are a still few bugs in there. Would love some feedback on it.