It's a well-written article, but it probably isn't anything new to most people here. It basically boils down to the fact that you can do signal analysis on the available metadata. The more easily you can correlate the query with the response, the more easily you can nullify the value of the encryption. Keeping "live" data secure is inherently a hard problem. 0a46b9db36e3bd83ddccb29c32c207546ea3c4c5ffdce9ebe308eb70f8d29708