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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 tapesgif. It is possible that we could incorporate some hashing and digital signature scheme into our framework by extending the TCFS format with a new field. This was beyond the scope of my work, but our design should not preclude the use of such a system.