Internet of Things is still very immature. There is not even a consensus in what it means. It covers many different technologies like the new entrants wearables and connected household supplies, but also the very mature technologies in m2m. Vendors large and small hurry to launch products and take their stakes in this emerging markets. ITU-T standards and industry consortiums popping up everywhere that try to make some order in this chaos, but as the quote says, there are no common agreed uniform standards just yet.
So, if you start your IoT development projects today, there might not be one simple way of doing secure IoT. Different products and implementations require different solutions and strategies. A wearable will be something completely different from a connected medical device, or a Smart Home, or Smart City. However, there are some common characteristics that need to be handled as product design criterias from the start: