Return the estimated strength of the underlying key against
the best currently known attack. Note that this ignores anything
but pure attacks against the key itself and do not take into
account padding schemes, usage mistakes, etc which might reduce
the strength. However it does suffice to provide an upper bound.
Return the estimated strength of the underlying key against the best currently known attack. Note that this ignores anything but pure attacks against the key itself and do not take into account padding schemes, usage mistakes, etc which might reduce the strength. However it does suffice to provide an upper bound.