可以通过各种方式来实现文件加密，但通常很少使用，因为这会加重系统管理员或用户的工作负担。

File encryption can be accomplished in a variety of ways, but it's rarely used because of the burden on system administrators or users.

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可以使用 IBM Database Encryption Expert 加密底层操作系统数据和备份文件。

You can use IBM Database Encryption Expert to encrypt the underlying operating system data and backup files.

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NetBSD 使用加密设备驱动程序 (CGD) 通过虚拟设备实现加密的文件系统。

NetBSD uses the cryptographic device driver (CGD) to implement an encrypted file system with a virtual device.

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