Automated Teller Machines (ATMs) are uniquely interesting targets. They are computer-based systems connected to global financial networks, meant to be unattended and open to the public 24 hours a day, and on top of all that, contain boxes of cold hard cash, sometimes totaling in the tens of thousands of dollars in a single machine. This talk will discuss the challenges in securing ATMs, the areas you should focus on when assessing the security of an ATM, various common flaws found when assessing ATMs, and some successful real-life attacks against ATMs.