Security is vital to the devices on the IoT, and too often it's not strong enough. Botnets grab up connected devices that aren't properly secured. When in industry play critical safety roles, the stakes are even higher. A compromised device regulating a machine could make it catch fire. A dangerous condition could go unreported, or false alarms could draw attention and resources away from real problems. These devices need to aim for six sigma security — 99.999996% defect-free operation. Meeting this need will require a radically new approach to their software.