The DEF CON 34 Badge Is an Open-Source FIDO2 Key — and It's Already Been Cracked
bunnie Huang's Baochip-1x made its first major production run as ~27,000 DEF CON 34 badges: a removable, physically-inspectable RISC-V module with an OLED, a QR camera, and a FIDO2 token mode. Within two weeks, someone extracted the shared light-game key.