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From: Heinz Diehl <htd@fancy-poultry.org>
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Subject: Re: [dm-crypt] "re-encrypting" ?
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On 14.08.2011, Steve Verniers wrote: 

> How would i convert the 256 bit encrypt to 128 ?

Actually, you can't. You'll have to backup your data somewhere and 
luksFormat the partition with the new parameters. Besides, I doubt that
128 bit gives noticeably more speed than 256 bit, even if your system is
somewhat old.