Binary package “libgfshare-bin” in ubuntu precise
utilities for multi-way secret-sharing
This package contains the gfsplit and gfcombine binaries.
gfsplit can be used to split a secret file (like a GPG secret key)
into multiple parts, so that at least some number of those parts are needed
to recover the original file, but any smaller combination of parts is useless
to an attacker. gfcombine is used to combine the parts created by gfsplit.
For instance, you might split a GPG key using a 3-of-5 share and put one
share on each of three computers, and two shares on a USB memory stick; then
you can use the GPG key on any of those three computers using the memory
stick, but if the memory stick is lost, you can recover the key by
bringing the three computers together.