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Gfsecret - Secret sharing tools
Gfsecret is a set of tools to facilitate secret sharing according to the
Adi Shamir’s secret sharing scheme.
The gfsec-use program allows to temporarily reconstruct a splitted file
from shares that have been dispersed on several external devices (USB
sticks and/or MTP-compliant devices like some smartphones or audio
The program needs a configuration file (by default,
$XDG_CONFIG_HOME/gfsecret/default.conf) which describes the shared
secret. Here is a sample configuration:
With such a configuration, gfse-use will attempt to reconstruct the file
‘/home/alice/mysecret’, using at least two of the three available
shares: one available on the local filesystem, one on a USB storage
device with the label ‘MYSTICK’, and one on a MTP-compliant device with
the serial number ‘RF2GB6X704P’. Gfsec-use will automatically detect
which devices are currently connected and will fetch from them the
Once the secret file has been reconstructed (if enough shares are
available), gfsec-use will spawn a new shell (or any other program
specified on its command line). When the shell (or the user-specified
command) terminates, the reconstructed secret file will be automatically
Gfsecret depends on the following libraries at compile-time:
– libgfshare <http://www.digital-scurf.org/software/libgfshare>, which
implements the secret sharing scheme proper (mandatory);
– GIO <http://developer.gnome.org/gio/>, to access shares stored on
external volumes (typically USB storage) (optional);
– libmtp <http://libmtp.sourceforge.net/>, to access shares stored on
MTP-compliant devices (optional).
Gfsecret is distributed under the terms of the GNU General Public
License, version 3 or higher. The full license is included in the
COPYING file of the source distribution.
Homepage and contact
The project is located at <http://www.incenp.org/dvlpt/gfsecret.html>.
The latest source code is available in a Git repository at
<git://git.incenp.org/gfsecret.git> and may also be browsed at
The author may be contacted at the following address:
Damien Goutte-Gattat <firstname.lastname@example.org>