PEFS - stacked cryptographic file system for FreeBSD
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PEFS (Private Encrypted File System) is a kernel level stacked cryptographic
filesystem for FreeBSD.

PEFS website:

The following is a list of its most important features:

*   Kernel level file system, no user level daemons needed. Transparently runs
    on top of existing file systems.

*   Random per file tweak value used for encryption, which guaranties different
    cipher texts for the same encrypted files.

*   Saves metadata only in encrypted file name, but not in file itself.

*   Supports arbitrary number of keys per file system, default directory key,
    mixing files encrypted with different keys in same directory.

*   Allows defining key chains, can be used to add/delete several keys by
    specifying only master key.

*   Uses modern cryptographic algorithms: AES and Camellia in XTS mode,
    PKCS#5v2 and HKDF for key generation.

FreeBSD wiki page:

Installation instructions:

# git clone git:// pefs
# cd pefs
# make obj all
# make install
# make clean