ReDS: A System for Revision-Secure Data Storage

The CLOUDwerker project seeks to develop a tool that allows for the collaborative creation of documents in a cloud environment. This necessitates a secure, non-repudiable document storage layer. We introduce ReDS, a software backend that stores encrypted documents in the cloud. The system also guarantees the non-repudiability of changes, makes older revisions of files accessible and has access control. Our architecture makes use of a trusted master server to store encryption keys and perform authentication and authorization. We implemented ReDS using Python and several open-source components. ReDS is open source and available for download.