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  3. March 2021

Re: VTL attacks

Once upon a time, back when tape came on 10" reels, there was a utility (from IBM??) that allowed you to read the tape in supervisor mode-- you'd see a list of what's on the tape-- HDR1, EOT mark, and then the files -after- the EOT marker. And you could copy files off of the tape!

Of course, that was long ago, with simpler tape formats. I don't know if it could handle compression, and certainly not LTO tapes! They hadn't been invented yet.

--Paul E Musselman

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At 5:51 PM +0100 3/25/21, Patrik Schindler wrote (in part):

It's also possible to instruct the tape drive to write an EOT marker at the beginning of the tape, by rewinding and opening the tape for write, and write no data. This overwrites probably important metadata. I don't know which tape technology can be forced to read behind that EOT marker. The data is physically still on the tape but can't be accessed.

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