As the number of Internet connected-devices in any home skyrockets from a few, to a few dozen, to perhaps even a few hundred—including interconnecting thermostats, appliances, health and fitness monitors and personal accessories like smart watches—security concerns for this emerging Internet of Things (IoT) will skyrocket too. Cisco projects that there will be 50 billion connected devices by 2020; each such node should ideally be protected against malware, spyware, worms, and trojans, as well as overzealous government and commercial interests who themselves might produce their own privacy-compromising intrusions.

http://spectrum.ieee.org/riskfactor/consumer-electronics/standards/looking-for-the-key-to-security-in-the-internet-of-things