On 2 April 2016 at 20:31, Kai Krakow <hurikha...@gmail.com> wrote:
> Am Sat, 2 Apr 2016 11:44:32 +0200
> schrieb Marc Haber <mh+linux-bt...@zugschlus.de>:
>
>> On Sat, Apr 02, 2016 at 11:03:53AM +0200, Kai Krakow wrote:
>> > Am Fri, 1 Apr 2016 07:57:25 +0200
>> > schrieb Marc Haber <mh+linux-bt...@zugschlus.de>:
>> > > On Thu, Mar 31, 2016 at 11:16:30PM +0200, Kai Krakow wrote:
>>  [...]
>>  [...]
>>  [...]
>> > >
>> > > I cryptsetup luksFormat'ted the partition before I mkfs.btrfs'ed
>> > > it. That should do a much better job than wipefsing it, shouldnt
>> > > it?
>> >
>> > Not sure how luksFormat works. If it encrypts what is already on the
>> > device, it would also encrypt orphan superblocks.
>>
>> It overwrites the LUKS metadata including the symmetric key that was
>> used to encrypt the existing data. Short of Shor's Algorithm and
>> Quantum Computers, after that operation it is no longer possible to
>> even guess what was on the disk before.
>
> If it was encrypted before... ;-)

What does wipefs -n find?
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