Efficient certificateless public integrity auditing of cloud data with designated verifier for batch audit

In the cloud storage environment, scholars have proposed data integrity auditing schemes to ensure the integrity of data in the cloud. In some scenarios, users may need to designate an auditor to perform auditing tasks, however, most existing cloud auditing schemes are not applicable. A small number of cloud auditing schemes with designated verifiers use PKI cryptography and identity-based cryptography, which has complex certificate management and key escrow problems. Therefore, based on the certificateless signature algorithm of the specified verifier, we construct an efficient certificateless provable data possession mechanism in the cloud with a designated verifier called CL-DV-PDP. Based on of meeting the above user’s requirement, our scheme can also perform a batch audit of multi-user data at the same time. We use a dynamic hash table to dynamically update the cloud data and the scheme also supports privacy protection. We define the security model of the scheme in detail, and the security of the scheme is proved based on the CDH assumption under the random oracle model. In the efficiency analysis section, we compare the functions and computational costs of our scheme with the relevant references, the result shows that the functions of the scheme are comprehensive and our scheme is efficient.