- How to use eCryptfs (Cryptographic Filesystem) in Ubuntu Linux

eCryptfs is a kernel-native stacked cryptographic filesystem for Linux. Stacked filesystems layer on top of existing mounted filesystems that are referred to as lower filesystems. eCryptfs is a stacked filesystem that encrypts and decrypts the files as they are written to or read from the lower filesystem.

eCryptfs encrypts and decrypts individual data extents in each file using a unique randomly generated File Encryption Key (FEK). The FEK is encrypted with the File Encryption Key Encryption Key (FEKEK), and the resulting Encrypted File Encryption Key (EFEK) is stored in the header of each lower file.

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source:http://linuxpoison.blogspot.com/2010/10/13578167754312.html

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