Implementing cryptography on embedded devices is a challenging task: On the one hand, most implementations have to fulfill demanding design goals in terms of e.g.cost, power-consumption, speed, and/or throughput.On the other hand, the measures to protect them against the ever-increasing means of adversaries are opposed to these goals.This talk will show why protection against implementation attacks is essentials by discussing different attack methods and recent developments in this area.Further, we will highlight ways to detect and prevent such attacks.