> Andreas Grassl wrote:
>
>> i encrypted a partition with
>>
>> cryptsetup -c aes-cbc-essiv:sha256 -y -s 256 luksFormat /dev/sda6
>>
>> but forgot to wipe the data first :-)
>>
>> now i thought to write simply a zero-file on the encrypted partition to
>> fill the whole space.
The problem with writing zeros is that every block will be encoded the
same so it's possible to see where the real data ends and the encoded
zeros blocks begin.
Using (u)random is not really necessary 9and is expensive) since the
data is going to be 'scrambled' anyway but some sort of arbitrary
non-repeating data is needed.
Random data is needed if you are preparing the raw partition.
Dick
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