The goal of this workshop is to teach participants how to use patch diffing techniques to analyze real-world vulnerabilities in Microsoft Windows via (CVE-2023-28302) and Android via (CVE-2022-36934). The main point of the workshop is to help researchers understand that they already have the information and tools needed to understand complex vulnerabilities. By learning to patch diff "in the dark", a researcher can progress from knowing about a vulnerability to actually understanding its root cause.