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This paper, proposes an effective and flexible distributed scheme with explicit dynamic data support to ensure the correctness of users data in the cloud. The authors rely on erasure correcting code in the file distribution preparation to provide redundancies and guarantee the data dependability. This construction drastically reduces the communication and storage overhead as compared to the traditional replication based file distribution techniques. By utilizing the homomorphic token with distributed verification of erasure coded data, their scheme achieves the storage correctness insurance as well as data error localization, whenever data corruption has been detected during the storage correctness verification, their scheme can almost guarantee the simultaneous localization of data errors, i.e., the identification of the misbehaving server(s).
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