Netflix’s Secret City shows how technology is changing spycraft

In one scene in Secret City, the 2016 Australian series now playing on Netflix, a spy comes to a park with a bag of bread crumbs, feeding birds as a cover for picking up an encoded message. It’s a classic trope, but the twist here is that the spy is picking up a SIM card rather than a note or a whispered message.
The Cold War ostensibly ended with the fall of the Soviet Union, but a new one is heating up, pitting the United States against both China and Russia in an arms race that relies