Far better to use public-key signatures

One has to take into effect that when most times people say that it doesn't increase the work
load they are talking about order of magnitude things... and that it doesn't increase the
factor if certain factors are true. Finding a match between SHA1 and 'pull out unrelated of my
butt' Hash might only extend the time to see it by months or years versus decades... and is
not non-trivial.. may only be 'trivial' to the mathmetician who was testing it against a
theoretical 10^20 years to find a match.