Security in the Internet of Things (IoT) leaves much to be desired. Some of the recent DDoS attacks such as those through Mirai on DNS provider Dyn or on popular security site KrebsonSecurity have been possible due to weak security measures in things like network connected cameras. There are many reasons why the situation is what it is today, but that will not be the topic of this entry. While we have seen some initiatives, notably the security guidelines (PDF) by NIST and some comments made by Bruce Schneier, I feel that this leaves a lot of people wondering what practical measures to take to secure their devices. Many companies in the IoT are start-ups lacking a proper understanding of what security in the embedded field entails, and might lack (or didn't plan for) the budget to hire dedicated security people. The goal of this blog entry are to (hopefully) lift the veil on some of the methodologies that should be employed to create more secure IoT systems from a very practical point of view.