Privacy-Aware Secure Data Auditing for Cloud-Based Intelligence of Things Environment

Cloud-based Intelligence of Things (IoT) is significant for Augmented Enterprise Management Systems. Data integrity auditing is challenging in the IoT environment, mainly when the newer versions in the public cloud environment update existing encrypted data. The related literature on cloud-based intelligence relies on encrypted data uploading or locally handling encryption and decryption using user keys. Considering the security risk, storage constraints at the edge, and real-time environment, both approaches have limited applicability in the IoT environment. This article presents the privacy-aware secure data auditing (PASDA) framework at the cluster head for online data integrity verification. Specifically, the users hide data files by the blinding process with a generation of their corresponding signatures, which achieves data auditing by utilizing homomorphic techniques. A novel automated self-triggering/Self-auditing-based data integrity auditing system is proposed, which detects the changes made in the cloud-stored data and sends alert messages to the trusted primary cloud server and users. A data dynamics method is developed containing a timestamp with a pointer to store multiple versions of the same file without signatures regeneration for the whole same file. The user is revoked due to prolonged absence or detection of the missed behavior with system or service expiry. With these data dynamics, the proposed PASDA framework allows CH to regenerate signatures of the revoked user using its membership key for cloud-based stored data access and data integrity auditing. In-depth security analysis and extensive simulations based on comparative performance evaluation attest to the benefits of the proposed PASDA framework compared to the state-of-the-art techniques.