A proof-of-concept for a hidden, offline secret storage system embedded in an everyday USB device, built with Arduino.
This project is a proof-of-concept and is NOT a production-ready security tool. The prototype implementation on the limited Arduino hardware (ATmega32U4) has several known cryptographic weaknesses (e.g., weak Key Derivation Function, fixed IV usage in the initial version, and lack of integrity checks). Do not use this code to store real, sensitive data.
