eCryptfs - Enterprise Cryptographic Filesystem

eCryptfs is a POSIX-compliant enterprise-class stacked cryptographic filesystem for Linux.It is derived from Erez Zadok's Cryptfs, implemented through the FiST framework for generating stacked filesystems. eCryptfs extends Cryptfs to provide advanced key management and policy features. eCryptfs stores cryptographic metadata in the header of each file written, so that encrypted files can be copied