[dm-crypt] "re-encrypting" ?

Steve Verniers sverniers79 at gmail.com
Sun Aug 14 03:10:56 CEST 2011

Hi wolfgang.  Thank you for your fast response.

What would 
> dd if=/dev/mapper/[cryptdevice] of=/dev/[device] conv=notrunc
Actually do then ?
Would it revert back to no encryption ? How would i convert the 256 bit encrypt to 128 ?


Sent from my iPhone

On 14-aug.-2011, at 01:35, wolfgang.aigner at gmx.de wrote:

> Hello Steve,
>> I have encrypted my FS with cryptsetup and see it's
>> 256bit but I found that it is too taxing on my systems resources (only
>> Pentium 4 machine with 2GB ram)  Could I "re-encrypt" the FS without
>> loosing
>> the data which is already stored on it ?  I have no room to backup so much
>> space.
> Yes, but its always dangerous and you could loose all your data. Don't trust on that and do a backup. If it doesn't matter if you loose anything you could use: 
> dd if=/dev/mapper/[cryptdevice] of=/dev/[device] conv=notrunc
> Be aware this is DANGEROUS.
>> Also what would be a recommanded bit for a system such as mine ? 64bit ?
>> 128
> You get a bit more Speed with 128 Bit AES, but still it is slower than withou encryption.
> cheers
> Wolfgang
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