Introduced in 2011, HID Global’s iCLASS SE solution is one of the world’s most widely-deployed Electronic Physical Access Control platforms. HID's iCLASS SE Readers are ubiquitous in electronic physical access control and used in most government agencies and Fortune 500 companies. The readers can be easily seen and identified in almost every form of mainstream media. Almost 13 years after iCLASS SE’s introduction, ground-breaking research and technical exploits will be disclosed publicly for the first time. In this talk, we detail the process by which we reverse engineered the complex hardware and software chain of trust securing HID’s iCLASS SE platform.