Re: SAVxxx TAPES: undoubtfully identifying NOT-local origin (e.g. jury Court room)

Antonio,

One could interrogate objects as they are restored and see which of those objects were last saved on your originating system and also contained the proper time-stamp, and that would give you some degree of confidence that the data had not been manipulated.

But if your requirement is to be able to "positively, strictly, identify that tape as being NOT-one-of-ours-for-sure", then I think you must encrypt, hash, and/or sign the data as it leaves the source system. There are a number of options for doing encryption today, and the technology is getting better and more usable every day. Any other solution can increase the likelihood that you can tell when data is encrypted, but none other would make me absolutely positive.

jte




On Apr 14, 2010, at 9:05 AM, Antonio Fernandez-Vicenti wrote:

Assume you have several iSeries systems.
Some has stolen one of your tapes with LIBxxx objects (files, etc).
Restores it to a different system. Modifies some / much of the data,
then does a SAVLIB.

If the case arrives, ... Can you positively, strictly, identify that
tape as being NOT-one-of-ours-for-sure?

e.g., by means of dumping control blocks at the beginnig of the tape, or
any other similar ways.
I guess System's SYSNAME or SerialNo. are not kept in the tape's data
control blocks.
And, even if it is, can you strictly prove "it-is-NOT-our-tape"?

TIA

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Antonio Fernández-Vicenti
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