Integrity for cloud data using certificateless cryptography

Cloud based cyber physica lsystem (CPS)enables individuals to store and share data collected from bothcyberspace and the physical world. This leads to the proliferationof massive data at a user’s local site. Since local storage systemscan’t store and maintain huge data, it is a wise and practicalway to outsource such huge data to the cloud. Cloud storageprovides scalable storage space to manage data economicallyand flexibly. However, the integrity of outsourced data is acritical challenge because user’s lose control of their data onceit’s transferred to cloud servers. Several auditing schemes havebeen put forward based on public key infrastructure (PKI) oridentity-based cryptography to verify data integrity. However,“the PKI-based schemes suffer from certificate managementproblem and identity-based schemes face the key escrow”problem. Therefore, to address these problems, certificatelesspublic auditing schemes have been introduced on the basis ofbilinear pairing, which incur high computation overhead, and thus it is not suitable for CPS. To reduce the computationoverhead, in this paper, Using elliptic curve cryptography, we propose an efficient pairing-free certificateless public auditingscheme for cloud-based CPS. The proposed scheme is moresecure against type I/II/III adversaries and efficient comparedto other certificateless based schemes

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