&gt;  I don&#x27;t know that the Five Eyes have the kind of temporal resolution in their measures that would be needed to conduct these kinds of attacks. In fact, it&#x27;s very likely that they don&#x27;t.<p>Why is it unlikely for them to have that kind of temporal resolution? I would assume the opposite. It seems like it would be trivial to save timing information along with packets. And the timing data must be relatively small compared to whatever data they&#x27;re saving on the packets, so the added storage requirement is not really a concern.