One issue not addressed in the design of the TCFS system was
authenticity. If we are intending to use these tapes as prior art in
patent cases, it is always possible that someone may have accidently
or intentionally changed the data in our archives. The CRC built into
each TCFS file is protection against media errors, but it does nothing
to show that our current archives are an accurate representation of
the backup tapes
. It is possible that we could incorporate
some hashing and digital signature scheme