An Efficient Secure Distributed Cloud Storage for Append-only Data
This addresses the challenge of efficient and secure data management for users outsourcing append-only data to cloud servers, representing an incremental improvement over existing static data schemes.
The paper tackles the problem of securely storing append-only data in distributed cloud storage by proposing a scheme that allows servers to update parity blocks autonomously, eliminating the need for clients to download data for tag updates.
Cloud computing enables users (clients) to outsource large volume of their data to cloud servers. Secure distributed cloud storage schemes ensure that multiple servers store these data in a reliable and untampered fashion. We propose an idea to construct such a scheme for static data by encoding data blocks (using error-correcting codes) and then attaching authentication information (tags) to these encoded blocks. We identify some challenges while extending this idea to accommodate append-only data. Then, we propose our secure distributed cloud storage scheme for append-only data that addresses the challenges efficiently. The main advantage of our scheme is that it enables the servers to update the parity blocks themselves. Moreover, the client need not download any data (or parity) block to update the tags of the modified parity blocks residing on the servers. Finally, we analyze the security and performance of our scheme.