A Prototype of a Secured File Storing and Sharing System for Cloud Storage Infrastructure

With the increased popularity of third-party cloud storage services, privacy has become a major concern. As cloud storage services can be availed at a minimum price now-a-days, it comes with a greater cost, vulnerability of being accessed by anyone else. To ensure reliability, most of the cloud service providers keep multiple copies of files. This becomes a serious privacy issue when the replicated copies remain in the server even after the owner has deleted the original file. To solve this problem, several models such as FADE, MADS, SFADE+ etc. were proposed that ensures assured file deletion but has limitations of their own. We have designed a system using the existing cryptographic approaches which ensures assured deletion of files resolving the limitations that remained un-patched by the previous models. The primary focus of our proposed model is to ensure user privacy and security through a user-friendly system which is computationally less intensive and does not rely upon any trusted entity. For factual exhibition, we have implemented a prototype named CryptedCloud which assures file deletion without relying upon any trusted body with no compromise to the performance and user-friendliness.