Abstract: The project's primary objective is to bolster the security of files stored in public cloud environments by implementing additional security measures. The focus is on developing an application that introduces an extra layer of protection to cloud storage, safeguarding files from potential attacks. Concerns arise from the delegation of data to third-party administrative control in cloud computing, which exposes data to security threats from other users and nodes within the cloud. The proposed solution revolves around the division of a file into fragments, which are then strategically distributed across various cloud storage spaces. This fragmentation and distribution strategy augments security, creating a formidable challenge for attackers attempting to access meaningful information, even if they compromise a specific cloud node. The methodology emphasizes the replication of fragmented data across multiple cloud nodes, ensuring a heightened level of security for stored files.

Significantly, the method adopts a progressive recovery mechanism, surpassing conventional crypto techniques in terms of rate-distortion. This innovative approach significantly enhances the efficiency and effectiveness of recovering hidden information from encrypted images. In summary, the project addresses security concerns in public cloud storage through file fragmentation, distribution, and the application of an advanced crypto technique for reversible data hiding in encrypted images.

Keywords: File Fragmentation, Cloud Security, Cloud Storage.

| DOI: 10.17148/IARJSET.2024.11814