Cloud technology provides many benefits in
terms of computing and storage. Accessibility from
anywhere and on-demand service provision maximizing the
available resource utilization are the major features of
Cloud storage. However, one of the major problems in cloud
storage is ‘Data Integrity’. In order to ensure data integrity,
it is in practice to have the cloud data audited by a third
party auditor. However, this poses a threat to data privacy
as the data has to be exposed for carrying out the audit
process. The proposed work suggests an approach such that
the Third party auditor will be able to audit the data
without accessing the actual user data. Hence, privacy of the
data is preserved. This is achieved by dividing data into
blocks and generating hash using the latest of MAC
algorithms, Secure Hash Algorithm (SHA-3). The hash
values are stored in a Merkle tree for efficient organization
of the hash values generated. This process is carried out on
both the client end and the cloud service provider end. The
top root hash value is sent to the TP auditor and individual
hash values are stored in cloud storage. While performing
the audit, the TP auditor requests hash values from the
cloud owner. Data Integrity is confirmed by comparing the
hash values obtained from the cloud owner and cloud service
provider. If the values match, integrity is confirmed. The
proposed approach is implemented in Hadoop and the
results are analyzed.
L. Gayathri : Department of Information Technology
Thiagarajar College of Engineering,
Madurai-15, Tamil Nadu
R. Ranjitha : Department of Information Technology
Thiagarajar College of Engineering,
Madurai-15, Tamil Nadu
S. Thiruchadai Pandeeswari : Department of Information Technology
Thiagarajar College of Engineering,
Madurai-15, Tamil Nadu
P.T. Kanmani : Department of Information Technology
Thiagarajar College of Engineering,
Madurai-15, Tamil Nadu
Third-Party Audit
SHA-3
Merkle Tree
Data
Privacy
Data Integrity
The proposed system guarantees the achievement of data
integrity. This system also supports Public Auditing by
making use of TPA and Privacy Preserving by not
exposing the data to TPA during integrity verification
process. Since we are using SHA-3, it resists attacks with
complexity 2n where n is the hash size. This will
completely remove the burden of client and helps to keep
the data safe.
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