Abstract
Secured storage system is a critical component in cloud computing. Cloud clients use cloud auditing schemes to verify the integrity of data stored in the cloud. But with the exposure of the auditing secret key to the Cloud Service Provider, cloud auditing becomes unsuccessful, however strong the auditing schemes may be. Therefore, it is essential to prevent the exposure of auditing secret keys, and even if it happens, it is necessary to minimize the damage caused. The existing cloud auditing schemes that are strongly resilient to key exposure are based on Public Key Infrastructure and so have challenges of certificate management/verification. These schemes also incur high computation time during integrity verification of the data blocks. The Identity-based schemes eliminate the usage of certificates but limit the damage due to key exposure, only in time periods earlier to the time period of the exposed key. Some of the key exposure resilient schemes do not provide support for batch auditing. In this paper, an Identity-based Provable Data Possession scheme is proposed. It protects the security of Identity-based cloud storage auditing in time periods both earlier and later to the time period of the exposed key. It also provides support for batch auditing. Analysis shows that the proposed scheme is resistant to the replace attack of the Cloud Service Provider, preserves the data privacy against the Third Party Auditor, and can efficiently verify the correctness of data.
Highlights
Cloud storage is one of the services provided by the cloud, where a client can store data in the data centre managed by the Cloud Service Provider (CSP)
With forward security, the authenticators generated using the secret keys of time periods earlier to the time period of the exposed secret key could be preserved. e authenticators of remaining time periods, i.e., the authenticators generated using the exposed key and those generated from the secret keys of time periods later to the time period of the exposed key could be forged [15]. is is because the adversary can derive the future auditing secret keys from the exposed one. Considering these facts, this research focuses on minimizing the impact of damage to the data integrity in time periods both earlier and later to the time period of the exposed key in Identity-based cloud storage auditing schemes
E Fuzzy Identity-based scheme [25] uses the biometric data of the client as the client’s identity for improved security. is biometric-based identity increases the computational cost of the cloud client, the cloud server, and the the ird Party Auditor (TPA). Many of these Identity-based schemes do not consider the auditing secret keyexposure. e Identity-based scheme in [26] is a lattice-based cloud auditing scheme and provides only forward security. It shows that the auditing secret key exposure is a critical issue in cloud storage auditing and needs to be handled efficiently
Summary
Identity-Based Public Auditing Scheme for Cloud Storage with Strong Key-Exposure Resilience. E existing cloud auditing schemes that are strongly resilient to key exposure are based on Public Key Infrastructure and so have challenges of certificate management/verification. E Identity-based schemes eliminate the usage of certificates but limit the damage due to key exposure, only in time periods earlier to the time period of the exposed key. An Identitybased Provable Data Possession scheme is proposed It protects the security of Identity-based cloud storage auditing in time periods both earlier and later to the time period of the exposed key. Analysis shows that the proposed scheme is resistant to the replace attack of the Cloud Service Provider, preserves the data privacy against the ird Party Auditor, and can efficiently verify the correctness of data
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