Oracle HSM: Implementing and Understanding Message Digests or Checksums Using ssum (Doc ID 2197981.1)

Last updated on NOVEMBER 13, 2023

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Purpose

This document discusses the different checksum options available when using the 'ssum' command.

Scope

Message digests (checksums) let you detect damage, data corruption, and unauthorized modifications to files, so that you can correct hardware problems and replace unsound files with sound copies stored elsewhere in the archive. It lets preservationists test archived files for changes that might indicate gradual deterioration, hardware or operator error, or deliberate, unauthorized alterations to the content.

A message digest is simply a mathematical summary of a file’s contents that has been generated by a one-way cryptographic hash function. Re-computing a file’s digest and comparing the resulting value to a stored digest value shows whether the file has changed.

Details

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