Guardian, MedCrypt’s embedded library, makes certain cryptography functions, like signature verification and data encryption, available via an easy to use API/ABI. This allows a user to sign code, data, instructions, configurations, etc. and verify these data structures before they are loaded into an active device, as well as ensure the privacy of sensitive data. Guardian can use keys signed by Overwatch, our key management system, or keys signed by another PKI tool. Devices and their keys are tracked within Overwatch, simplifying Postmarket management and incident response. We've built this system with the unique needs of medical devices in mind (like intermittent connectivity, and the need to maintain clinical functionality at all costs).