ShadowCat: Reviving File Transfer for Devices With Dead Radios

ShadowCat solves a critical problem for users with older or malfunctioning devices: enabling file transfer when Bluetooth, NFC, and other wireless technologies have failed. Leveraging only camera and browser capabilities in a fully offline setup, this solution demonstrates that devices with 'dead radios' can still securely exchange files—offering a zero-infrastructure, privacy-respecting alternative to cloud services.