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3.15.4 Why val doesn't solve the whole problem

Things that paranoid people might bear in mind are

Things that an optimistic person might bear in mind are

The summary is that it is theoretically possible to fool the integrity checks performed by the sccs file checksum and by val but the checksum isn't fooled often and the chances of fooling both together are very small. The use of quality hardware reduces the chance of data corruption yet further.