AUTHORIZED PUBLIC AUDITING ON CLOUD DATA
Mohammed Mujeer Ulla, VinayHegde · IJITR · 2015
A new era in Information Technology is Cloud Computing, as it provides various scalable and elastic Information Technology services in pay-as-you-use basis, where the customers of cloud can reduce huge capital investments involved in IT infrastructure. In this aspect cloud users who use storage services no longer physically maintain direct control over the data that is stored in cloud, which makes data security as one of the major issues while using cloud. The earlier research work allows integrity data to be certified without possession of actual data file. When verification is done by a trusted third party, then such verification is known as Data Auditing and the person who does the auditing is called as Auditor. Such schemes in reality suffer from several drawbacks: 1) A required process of Authentication/Authorization is unavailable between the cloud service provider and auditor. i.e anyone who is willing to challenge the cloud service provider to obtain the integrity of certain file, there by puts the quality of so called ‘auditing-as-a-service’ at risk. 2) The recent research work that was carried out on BLS signature can support updates full dynamic data on constant/fixed size of data blocks, this support is only towards fixed size blocks as basic unit which I call it as Coarse-grained updates. Due to which every small update would cause re-computation and updating of the authenticator for an entire file block, which results in over heads like higher usage of storage space and communication overheads. In this Project I would enable a formal analysis for all possible types of fine-grained updates and bring out a scheme that can fully support authorized auditing and fine grain update requests.