instead of wiping the data, filling an encrypted volume with zeros

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hi, i have a question:

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.

is this stupid and opens the door to brake the cipher, or is there no
problem??

grüsse

ando


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