加密文件系统和可信恢复是保障计算机安全，增强操作系统安全性的两项关键性技术，本文集中对这两项技术做了较为深入的研究。
Encrypted file system and trusted recovery are two important technologies for improving the security of OS, and this paper makes a deep research on them.
因此，系统安全性还存在问题，我们需要进一步改进、完善这个文件系统。
Therefore, the security of the system sill there are problems exist, we need to further improve and perfect the system of this document.
因此，系统安全性还存在问题，我们需要进一步改进、完善这个文件系统。
Therefore, the security of the system sill there are problems exist, we need to further improve and perfect the system of this document.
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