Re: aes-256-xts on a 2.5TB volume ... How much trouble am I in?

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>> I've recently finished setting up our new file server, whose largest
>> filesystem is 2.5TB in size; ext3 on dm-crypt (aes-256-xts) on lvm on
>> md-raid5.

For the record, that should be aes-512-xts throughout ...

> Also, you need to think about what your attacker model is.

Not a very sophisticated one. Encryption enables me to RMA/sell/give
away disks with reasonable expectation that the data on them won't be
read. Since we're tight on space the server isn't as physically secure
as I'd like. I doubt anyone could walk off with it without my
knowledge, but rebooting into a root shell would be possible.

> Well, you can always use your backup procedure to move the data off and put it back on under new encryption.

I could, but it's a real PITA :)

> the data above 2T is less secure but all data is less secure.
> It is encrypted, it does not get lost and it does not overwrite other
> data.

To be honest, I couldn't quite parse that one, but the gist of it
seems to be positive. I'll leave the box as-is for the moment and see
if I can't do something about that performance problem first, lest I
have to redo the whole thing twice.

Thanks for your help,

Chris
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