This paper will attempt to explain some of the side-channel attack techniques in a fashion that is easily comprehensible by the lay-man. What follows is a presentation of three di erent attacks (power, timing and fault attacks) that can be carried out on cryptographic devices such as smart-cards. For each of the three attacks covered, a puzzle and it`s solution will be given, which will act as an analogy to the attack. How these attacks can be applied to real devices will also be discussed.