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中文摘要：
针对保护云存储中用户数据机密性的问题，提出了一种在云服务提供商处加密数据的云存储方案。通过虚拟机隔离技术来构造封闭计算环境，改进RSA公钥加密算法使其不需要重新产生大素数就能实现密钥变化，并通过SSL安全链接传输数据以及密钥，将数据在封闭计算环境中安全加密后再存储至分布式文件系统。封闭计算环境能阻止操作系统中不良应用以及云管理员的攻击，有效防范数据泄露。实验结果表明，用户数据的机密性得到了提升，并且相较于其他在云端加密的云存储方案，所提方案所带来的性能损耗降低了许多。
英文摘要：
Aiming at protecting the confidentiality of data for cloud storage users,a scheme that encrypt data in cloud service providers was presented.The scheme constructed a closed-box computing environment by virtual machine isolation technique,improved algorithm of RSA to change keys without having to produce large prime numbers,transfer data and keys through SSL and encrypted data in the closed computing environment before storing to the distributed file system.Closed-box computing environment can prevent attacks from cloud administrators and malicious applications in the operating system.It also can guard against data leakage effectively.The result of experiment shows that the confidentiality of data improved and the performance loss is decreased considering to other cloud storage scheme that encrypt data in cloud.
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