Verifiable and Controllable Data Sharing With Compliance Checking in Cloud Computing

This paper proposes Verifiable Data Capsule (VDC), a method for secure data sharing in cloud computing where data owners encrypt their data and upload it with access policies to a cloud server, allowing only authorized users to process the data in a TEE (Trusted Execution Environment, a secure zone on a computer where data stays protected). The system addresses a problem with existing approaches: malicious servers could trick users by providing outdated or corrupted data, so the researchers designed a lightweight verification method called Locally Verifiable Chameleon Tag (LVCT) that lets users confirm data hasn't been tampered with or replaced.