From: Milan Broz <gmazyland@gmail.com>
To: Lara Michaels <laramichaels1978@yahoo.com>
Cc: "dm-crypt@saout.de" <dm-crypt@saout.de>
Subject: Re: [dm-crypt] is backing up the master key enough for data recovery if header is destroyed?
Date: Thu, 21 Jun 2012 17:28:07 +0200 [thread overview]
Message-ID: <4FE33D87.2030207@gmail.com> (raw)
In-Reply-To: <1340290716.32577.YahooMailNeo@web120705.mail.ne1.yahoo.com>
On 06/21/2012 04:58 PM, Lara Michaels wrote:
> From reading the FAQ, my understanding is that in the event the
> header getting destroyed I need ONE of the following for data
> recovery to be feasible:
>
> - header backup + one passphrase - the master key
>
> By "master key" I am referring to the 256 bits printed out in
> hexadecimal by "cryptsetup luksDump --dump-master-key [device]".
>
> Is it correct that these 256 bits are by themselves sufficient to
> unlock the volume? Or would I still need the salt to be intact in the
> header? (My understanding from reading the FAQ is that the salt is
> not required if I have the master key.)
Yes. You need to know cipher name, mode and IV as well, but these
are easily to be brute-forced if lost.
Salt is not needed if you know volume (master) key directly.
Milan
prev parent reply other threads:[~2012-06-21 15:28 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-21 14:58 [dm-crypt] is backing up the master key enough for data recovery if header is destroyed? Lara Michaels
2012-06-21 15:28 ` Milan Broz [this message]
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