"I definitely subscribe to the idea that security is not about making unauthorized access impossible (no such thing), but rather about making it prohibitively e

"I definitely subscribe to the idea that security is not about making unauthorized access impossible (no such thing), but rather about making it prohibitively expensive (both in terms of resources and risk)." Exactly. There is no such thing as a foolproof security strategy. Anyone who tells you his plan is foolproof has already proven himself a fool. Security is about protection, mitigation, and contingencies. It is not about full-stop prevention. Build a 100-foot wall, and I'll build a 101-foot ladder. (Proverbially speaking, of course). "What is truly concerning is that per-capita, it is becoming more and more affordable for agencies to spy on every single person everywhere, all the time." This is probably 50% of what concerns me. The other 50% is the coming revolution in analysis. I use that word so strongly as to place it in <em>sterisks. Advances in machine learning will allow us to find needles in the mountains and mountains of haystacks that we're collecting now. It is truly marvelous (and also scary, depending upon your point of view) to consider what one could make of the most seemingly mundane of patterns and breadcrumbs.