Data deduplication is frequently used by many cloud service providers (CSPs) for efficient storage management. This process facilitates CSPs not to store the duplicate copies of a file. However, as data privacy is critical, data owners encrypt their data before outsourcing. Convergent encryption techniques have been proposed to enable deduplication over outsourced encrypted data. In this paper, we propose a server-aided data deduplication scheme for cloud storage, which supports duplication check across key servers. The most attractive feature of this scheme is the generation of fixed-size ciphertext regardless of the number of key servers. We showed that the proposed scheme achieves better performance than previous efforts both theoretically and experimentally. Further, we proved the security of the proposed scheme.

中文翻译：

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SEDS：用于云存储的安全高效的服务器辅助重复数据删除方案

许多云服务提供商（CSP）经常使用重复数据删除技术来进行有效的存储管理。此过程有助于CSP不要存储文件的重复副本。但是，由于数据隐私至关重要，因此数据所有者在外包之前先对其数据进行加密。已经提出了收敛加密技术来实现对外包加密数据的重复数据删除。在本文中，我们提出了一种用于云存储的服务器辅助数据重复数据删除方案，该方案支持跨关键服务器的重复检查。该方案最吸引人的特征是无论密钥服务器的数量如何，都会生成固定大小的密文。我们表明，无论是从理论上还是在实验上，该方案都比以前的工作取得了更好的性能。此外，我们证明了该方案的安全性。