[dm-crypt] re-format existing luks partition

shmick at riseup.net shmick at riseup.net
Fri Nov 22 12:49:43 CET 2013



Ondrej Kozina:
> On 11/22/2013 09:26 AM, shmick at riseup.net wrote:
>> can i re-format an existing luks partition (as the same /dev/sda[x] and
>> simply re-copy an fsarchive operating system backup straight to it
>> without anything further required ?
> 
> There's an offline cryptsetup-reencrypt tool in cryptsetup 1.5.0 and
> later. It's really offline so the device needs to umnouted before
> reencrypting.
> 
> Also you should consider shrinking the filesystem residing on the luks
> device (and after that also the device) before actual reencryption. It
> makes reencryption sector-by-sector no matter if it is used by
> filessytem or not.

thank you for the advice

> 
> Also there are some fixes ready for reencryption tool on the way so you
> may be also interested waiting for 1.6.3 release in coming weeks.

i shall wait around for some updates
just finally as an aside, is this method truly safe compared to starting
again ?

is there any peer review of cryptsetup's operation as a whole similarly
like truecrypt had by a german organisation a few years back ?

> 
> Regards
> Ondrej
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