ABSTRACT:
Cloud storage has been in widespread
use nowadays, which alleviates users’ burden of local data storage. Meanwhile,
how to ensure the security and integrity of the outsourced data stored in a
cloud storage server has also attracted enormous attention from researchers.
Proofs of storage (POS) is the main technique introduced to address this
problem. Publicly verifiable POS allowing a third party to verify the data
integrity on behalf of the data owner significantly improves the scalability of
cloud service. However, most of existing publicly verifiable POS schemes are
extremely slow to compute authentication tags for all data blocks due to many expensive
group exponentiation operations, even much slower than typical network
uploading speed, and thus it becomes the bottleneck of the setup phase of the
POS scheme. In this article, we propose a new variant formulation called
“Delegatable Proofs of Storage (DPOS)”. Then, we construct a lightweight
privacy-preserving DPOS scheme, which on one side is as efficient as private
POS schemes, and on the other side can support third party auditor and can
switch auditors at any time, close to the functionalities of publicly
verifiable POS schemes. Compared to traditional publicly verifiable POS
schemes, we speed up the tag generation process by at least several hundred
times, without sacrificing efficiency in any other aspect. In addition, we
extend our scheme to support fully dynamic operations with high efficiency,
reducing the computation of any data update to O(log n) and simultaneously only
requiring constant communication costs. We prove that our scheme is sound and
privacy preserving against auditor in the standard model. Experimental results
verify the efficient performance of our scheme.
SYSTEM REQUIREMENTS:
HARDWARE REQUIREMENTS:
·
System : Pentium Dual Core.
·
Hard Disk : 120 GB.
·
Monitor : 15’’ LED
·
Input Devices : Keyboard, Mouse
·
Ram : 1 GB
SOFTWARE REQUIREMENTS:
·
Operating system : Windows 7.
·
Coding Language : JAVA/J2EE
·
Tool : Netbeans 7.2.1
·
Database : MYSQL
REFERENCE:
Anjia Yang, Jia
Xu*, Jian Weng*, Jianying Zhou, and Duncan S. Wong, “Lightweight and
Privacy-Preserving Delegatable Proofs of Storage with Data Dynamics in Cloud
Storage”, IEEE Transactions on Cloud Computing, 2018.