Cloud storage is a mode of online storage in which data are stored on multiple virtual servers usually hosted by third parties. Cloud service providers manage and operate data storage as services. The major concern in cloud storage is the integrity of outsourced data. Many public auditing schemes which authorize the third party auditor (TPA) to check the integrity of outsourced data have been proposed. However, most of them are based on traditional public key cryptosystems. This paper proposes an efficient certificateless public auditing Scheme (CL‐PAS) in cloud storage. In the process of challenge and auditing, CL‐PAS ensures that malicious cloud servers cannot forge auditing evidences to deceive TPA to pass the verification, and prevents curious TPA from recovering original data from auditing evidences. So it strengthens privacy preserving. Security analysis shows that CL‐PAS scheme meets the predetermined security requirements. The simulation and performance analysis results show that, compared with similar schemes, CL‐PAS scheme has the higher efficiency.

中文翻译：

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一种高效的云存储无证书公共审计方案

云存储是一种在线存储模式，其中数据存储在通常由第三方托管的多个虚拟服务器上。云服务提供商将数据存储作为服务进行管理和运营。云存储的主要问题是外包数据的完整性。已经提出了许多授权第三方审计师 (TPA) 检查外包数据完整性的公共审计方案。然而，它们中的大多数是基于传统的公钥密码系统。本文提出了一种高效的云存储无证书公共审计方案（CL-PAS）。在挑战和审计过程中，CL-PAS确保恶意云服务器不能伪造审计证据欺骗TPA通过验证，防止好奇的TPA从审计证据中恢复原始数据。因此它加强了隐私保护。安全分析表明，CL-PAS 方案满足预定的安全要求。仿真和性能分析结果表明，与同类方案相比，CL-PAS方案具有更高的效率。