A provably secure and public auditing protocol based on the bell triangle for cloud data
Abstract With the rapid development of cloud computing, cloud storage has been accepted as a convenient service by an increasing number of organizations and individuals. However, when users lose control of their data, ensuring that the uploaded data are securely stored by the cloud becomes a critical requirement. A key research challenge associated with existing designs of data auditing protocols is the limitation of application scenarios due to low auditing efficiency. In order to address this problem, we propose a provably secure and public auditing protocol based on Bell triangle for cloud data with blockless verification and batch auditing. We introduce the associative property of Bell triangle; design an index conversion algorithm to convert the one-dimensional index to a two-dimensional index ensuring that the block signature satisfies the Bell triangle requirements, and develop a recursive association algorithm to ensure relevance between the signatures of adjacent file blocks. This protocol offers significant advantages over existing protocols in terms of auditing efficiency and security in a multi-user and high-volume environment. In addition, the security analysis and the results of the experiment indicate that the protocol is secure and efficient.