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Cloud storage enables users to upload, store and download their data. However, with the rapid growth of the Internet of Things (IoT) and edge devices, such as camera, the cloud not only manages the user generate data but also devices generated data. This increment in the volume of outsourced data has raised two important issues in big data management for cloud storage servers, namely, optimal data storage and data security. In order to solve the former issue, cloud storage employs a deduplication technique to avoids storing duplicate data; and uses encryption to solve the later issue. However, both these issues are orthogonal in nature. Thanks to convergent encryption that addresses both the issues simultaneously. Nevertheless, the existing approaches relies on proxy servers and put all the trust on third party, which is vulnerable to single point failure. In this paper, we propose a novel lightweight …