Secure multi-key file-sharing for cloud storage with erasure coding

Cloud storage provides users with immediate access to a broad range of files from anywhere in the world. When users store files in the cloud, however, there are critical concerns with data leakage and integrity issues. In this paper, we propose a new approach that integrates erasure coding with data encryption and data splitting to secure file-sharing for cloud storage. The basic idea of the proposed approach is that a file is not completely stored in the cloud, and only authorized devices or clients have their own unique key, which is derived from erasure coding, to fulfill the file exactly. By investigating three typical erasure codes, we analyze the efficiency and trade-offs of different file splitting strategies. The results show that it is promising to share files securely for cloud storage with erasure coding.