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How to Encrypt Directories with eCryptfs on Ubuntu 16.04

This tutorial shows how to use eCryptfs to encrypt a directory on Ubuntu 16.04 (Xenial Xerus). eCryptfs is a POSIX-compliant enterprise-class stacked cryptographic filesystem for Linux. You can use it to encrypt partitions and also directories that don’t use a partition of their own, no matter the underlying filesystem, partition type, etc.