[dm-crypt] Combining ciphers with LUKS possible?

[dm-crypt] Combining ciphers with LUKS possible?

[Andreas Heinlein]

Hello,

I have a question regarding possible ciphers for LUKS encryption.

I came across this when trying out the TCRYPT extension for cryptsetup. It seems that cryptsetup can map TrueCrypt/VeraCrypt devices with combined ciphers, such as Serpent/AES. cryptsetup status shows 'aes-serpent-xts-plain64' as cipher in this case.

So I wondered whether this was usable for LUKS, to. But it seems I cannot create a LUKS device with '... -c aes-serpent-xts-plain64 ...' Is there any way to accomplish this?

Thanks,
Andreas
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[dm-crypt] Re: Combining ciphers with LUKS possible?

[Arno Wagner]

Hi Andreas,

I think this was basically the result of the sometimes
special level of paranoia that went into the TC design.
I would say there really is no reason to mistrust AES at 
this time. Also remember AES gets hardware accelelration 
on most platforms these days, but Serpent (for example)
does not. That makes a rather large difference.

But if you think you really need this, you can layer LUKS or
put plain dm-crypt volumes inside each other and inside 
LUKS containers. May have bad performance impact beyond
the additional encryption though.

Regards,
Arno

On Fri, Jun 11, 2021 at 10:04:09 CEST, Andreas Heinlein wrote:
> Hello,
> 
> I have a question regarding possible ciphers for LUKS encryption.
> 
> I came across this when trying out the TCRYPT extension for cryptsetup. 
> It seems that cryptsetup can map TrueCrypt/VeraCrypt devices with combined
> ciphers, such as Serpent/AES.  cryptsetup status shows
> 'aes-serpent-xts-plain64' as cipher in this case.
> 
> So I wondered whether this was usable for LUKS, to.  But it seems I cannot
> create a LUKS device with '...  -c aes-serpent-xts-plain64 ...' Is there
> any way to accomplish this?
> 
> Thanks,
> Andreas
> _______________________________________________
> dm-crypt mailing list -- dm-crypt@saout.de
> To unsubscribe send an email to dm-crypt-leave@saout.de

-- 
Arno Wagner,     Dr. sc. techn., Dipl. Inform.,    Email: arno@wagner.name
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----
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