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Data Integrity
Is your information correct!
Most companies have control over the data which they keep on their servers and networks. Access controls are normally well understood and usually people have access to information on a "need to know" basis. Audit control ensures that changes made to critical or sensitive data are tracked thus assuring the integrity of the data.
When data is saved to tape it is normally for one of two reasons, firstly as an archive or to be able to restore the data in the case of loss. Once on tape you no longer have control of that data! It is possible for a file to be edited on the tape without any audit, or change control being recorded. If that data is then restored or brought back from archive it has changed without any means of flagging these changes.
By encrypting data whilst being written to tape, the integrity of the data is assured!
If your need is that of full integrity, tape encryption is essential to certify you are complying in all areas.
An unhappy employee could change data on an unencrypted tape and then create a situation where a restore was needed. You have no means of knowing that the live data you are now using has been changed!
For law enforcement requirements, where evidence must been proven to be unchanged from the original, Paranoia allows data to be archived until it is needed in court, so the integrity of the data cannot be challenged.
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