Published Paper Details:

Cloud is one of the widespread technologies in recent days, which reduces the user burden with the local data storage. Generally, ensuring the data integrity and security is highly essential for the cloud storage server. In which, the Proofs of Storage (POS) is identified as the emerging technique for addressing this issue. Then, the publicly verifiable POS allows the third party for verifying the data integrity of the data owner that improves the scalability of cloud service. In the existing works, the publicly verifiable POS schemes are very slow during the computation of authentication tags for the data blogs. Also, it requires expensive group exponentiation operation, which is the bottleneck of the setup phase of this scheme. Thus, this paper proposed a Delegatable Proofs of Storage (DPOS) scheme, which is a kind of lightweight privacy preserving technique. Here, the third party auditor can support and switch at any time based on the functionalities of the POS scheme. Moreover, we speed up the tag generation process without sacrificing the efficiency in other aspects. In addition to that, this mechanism can be extended to support the fully dynamic operations with better efficiency and reduced computation of any data update to O(log n). The results stated that the proposed scheme is better than the other privacy preserving models.