The Internet was supposed to give us access to the world's information, so that people, everywhere, would be able to know the truth. But that’s not how things worked out. Instead, we have a digital deception engine of global proportions. Nothing that comes through the screen can be trusted, and even the things that are technically true have been selected, massaged, and amplified in support of someone’s messaging strategy. Deception isn’t just about narratives - we see deception at every layer of the network stack, from spoofed electromagnetic signatures, to false flags in malware, to phony personas used to access networks and spread influence. They hide in our blindspots, exploit our biases, and fill our egos while manipulating our perceptions. How do we decide what is real? This talk examines time-tested maxims that teach the craft of effective deception, and then inverts those offensive principles to provide defensive strategies.