The cloud data service is now replacing local storage devices for bulk storage requirements as it takes all burdens related to storage management, accessibility, maintenance cost etc. Ensuring the integrity of outsourced data without a local copy is the most important challenge for cloud services. Though end-to-end encryption has become inevitable, semantically secure encryption renders various cost-effective storage optimization techniques, such as data de-duplication ineffective. There are possibilities for loss or inaccessibility of the data store even in the cloud server due to various factors including load balancing issues, interference of scheduled services, state change of instances etc. We propose a new enhanced secure threshold data de-duplication and regeneration scheme for cloud storage using Seed-block algorithm. A checksum based indexed backup engine supports the storage provider in locating and generating the instance and the data. In order to verify the integrity of the regenerated data, this work incorporates a checksum based public audit algorithm. A public verifiable authenticator has been experimented to relieve the data owners free from the burden of online private auditing. The proposed system has been implemented and tested with existing cloud services. Experimental results show that the proposed system succeeds in efficiently regenerating the data. Besides, the new scheme increases the response rate of the cloud service significantly.
Volume 11 | 09-Special Issue
Pages: 661-666
DOI: 10.5373/JARDCS/V11/20192619