  Securing a secret master key is a non-trivial task, we even argue it is
impossible to fully secure it, hence we must make it as difficult as possible
for any powerful adversary to steal or use the key. We introduce the reader to
interesting cryptography which is starting to get more attention in terms of
addressing the above problem, and we briefly overview some commercial and
open-source products that can be used. Finally, we propose a set of solutions
on how to secure master keys, more as guidelines rather than exact technical
specifications, with aim to inspire and raise awareness of how to increase the
security as much as possible.
