In the world of espionage, developing and exploiting access to vital sources of information are the primary objectives. And these days, finding a way into information systems seems easier than ever amid the growing number of "smart" devices connected to our homes and businesses. Voice-controlled and hands-free microphones and speakers -- Amazon's Echo and Alexa, Google's Home Assistant, Apple's Siri and Microsoft's Cortana, to name a few -- welcome technology into our lives and trumpet the dawn of a new era: the age of artificial intelligence (AI) and the internet of things....