You know the sound of *beep*… *Click* when using a badge to enter a door to a building, but how does this work and how can you hack it? This talk will explain the basics of what’s inside the readers and the badges, and how they communicate wirelessly. You will learn about the common tools available (Proxmark, Flipper, Keysy), how to get one and how to use it. We’ll talk about techniques to clone badges, and brute force systems to get access you never had in the first place. Once you’ve seen this talk, you can go try it yourself in the Physical Security Village at Ekoparty!