The number of organisations that use IoT devices with on-board analytics capabilities, edge computing, is rising rapidly. Carrying out the computing as close as possible to the source of the data that's being analysed increases privacy as well as speed while reducing the amount of data transmitted to the cloud (relieving network congestion). This is enabled by ever smaller, powerful and energy efficient devises. Although privacy is increased by edge computing, it requires special encryption mechanisms —data must travel between distributed nodes— and the choice of security methods available to edge devises is limited —they are usually resource-constrained—. Limited losses by hacks due to devises holding only few data.