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附录 C. 磁盘加密
C.1. 什么是块设备加密？
块设备加密通过加密保护块设备中的数据。要访问设备中加密的内容，用户必须提供密码短语或者密钥供验证。这可提供现有操作系统安全性机制以外的安全性，这样可在从系统中物理删除该设备时仍可保护其内容。
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