Message Encryption

Each group should have the option for chat encryption (or it be enforced for every chat rigidly).

The connection between client and server should be secure.

In other words, the way in which we create the connection is inherently insecure:

```Go
conn, err := grpc.Dial(a, grpc.WithInsecure())
```

Using SSL/TLS is the way to go.

[gRPC docs](http://www.grpc.io/docs/guides/auth.html)
