Storage-Efficient Certificateless Public Auditing Scheme With Data Dynamics in the Cloud

As the sharp growth of cloud storage, a rising quantity of public auditing techniques are employed to check outsourced data integrity. However, existing public auditing schemes have issues with storage efficiency, security, and practicality. During traditional auditing process, the cloud is required to store all data blocks and corresponding tags, resulting in poor storage space utilization. Besides, public auditing schemes that leverage the public key infrastructure encounter certificate management challenges, and identity-based schemes inherently suffer from key escrow vulnerabilities. Furthermore, the demand of data dynamic operations cannot be well implemented in existing schemes. Therefore, this paper proposes a storage-efficient certificateless public auditing (SECPA) scheme with data dynamics, which allows any authorized third-party auditor to perform integrity checking such that outsourced data will not be tampered with. Meanwhile, an improved locally verifiable technology is designed to extremely optimize the cloud storage resources. Additionally, our scheme avoids the certificate management and key escrow problems while supporting the user to conduct data insertion, deletion, and modification. The security analysis demonstrates that SECPA fulfills unforgeability, auditing soundness, data privacy protection and detectability. The experiment results indicate that our scheme exhibits appropriate performance.