I just found this really amazing Encrypted chat tool it's called Cryptocat and it's free! You can check it out here: https://crypto.cat
It follows OTR (Off the record) protocol and it's a really great tool.
Now here's the fun part it does not have any Sign Ups or anything. Now you must be wondering how do I contact someone then? Well, all you (and your friends) need to have the same conversation name. Well, it's quite simple Conversation Name should be the same. Thats all.
My conversation name is grahammiranda13