And what about when a notebook is encrypted? [LWN.net]

And what about when a notebook is encrypted?

Posted Sep 18, 2018 16:01 UTC (Tue) by epa (subscriber, #39769)
In reply to: And what about when a notebook is encrypted? by ThinkRob
Parent article: Fedora reawakens the hibernation debate

Presumably a known-plaintext attack could be mitigated a bit if you compress the memory dump before writing it to disk. A sliding-window compressor could be seeded with a fairly random initial window, or some small nondeterminism could be added to the construction of frequency tables for Huffman coding. Or do these ideas fall under the category of "please don't roll your own crypto"?

And what about when a notebook is encrypted?

Posted Sep 21, 2018 16:50 UTC (Fri) by ThinkRob (guest, #64513) [Link]

Or do these ideas fall under the category of "please don't roll your own crypto"?

I'd say so.

There probably are ways to defend against this though. Plus, AFAIK there aren't any significant known plaintext attacks against AES256 in XTS mode. And since this isn't a long-term storage situation but rather a short term one it's not like we have to worry about an exploit twenty years from now putting our data at risk.