From: Sebastian Andrzej Siewior <linux-crypto@ml.breakpoint.cc>
To: Mikulas Patocka <mpatocka@redhat.com>
Cc: Milan Broz <mbroz@redhat.com>,
dm-devel@redhat.com, Alasdair G Kergon <agk@redhat.com>,
linux-crypto@vger.kernel.org
Subject: Re: [PATCH] dm-crypt: disable block encryption with arc4
Date: Tue, 26 Jan 2010 14:34:13 +0100 [thread overview]
Message-ID: <20100126133413.GA5511@Chamillionaire.breakpoint.cc> (raw)
In-Reply-To: <Pine.LNX.4.64.1001260722080.20780@hs20-bc2-1.build.redhat.com>
* Mikulas Patocka | 2010-01-26 07:27:18 [-0500]:
>> yes, I think it is better.
>> (...and I just forgot to add that test to dm-crypt after that suggestion.)
>>
>> Milan
>
>Hmm, there is salsa20 that has block size 1, larger initialization
>vectors, and can be used to encrypt disks (although salsa20 doesn't
>currently work with dm-crypt, because it doesn't accept "ecb(), cbc(),
>etc." chaining modes --- but if you remove the chaining mode manually, it
>works).
>
>You should rather add a flag CRYPTO_ALG_CHANGES_STATE to determine that a
>cipher can't be used to encrypt disks.
Just because it will work does not make it a good idea.
SALSA20 is a stream cipher not a block cipher.
Block ciphers are used to encrypt data.
Stream ciphers are used to create one time pads, a set of encryption
keys, ...
There are block modes like CTR which can turn a block cipher into a
stream cipher. Those should not be used for disk encryption as well.
>
>Mikulas
Sebastian
next prev parent reply other threads:[~2010-01-26 13:34 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-25 18:29 [PATCH] dm-crypt: disable block encryption with arc4 Mikulas Patocka
2010-01-25 18:39 ` Milan Broz
2010-01-26 9:22 ` Sebastian Andrzej Siewior
2010-01-26 10:48 ` Milan Broz
2010-01-26 12:27 ` Mikulas Patocka
2010-01-26 13:34 ` Sebastian Andrzej Siewior [this message]
2010-01-26 17:11 ` Mikulas Patocka
2010-02-09 7:37 ` Herbert Xu
2010-02-09 14:02 ` Mikulas Patocka
2010-02-09 20:42 ` Herbert Xu
2010-02-09 14:57 ` Sebastian Andrzej Siewior
2010-02-09 20:45 ` Herbert Xu
2010-02-09 21:12 ` Sebastian Andrzej Siewior
2010-02-09 21:45 ` Herbert Xu
2010-02-12 8:42 ` [PATCH] crypto/arc4: convert this stream cipher into a block cipher Sebastian Andrzej Siewior
2010-02-12 9:34 ` Adrian-Ken Rueegsegger
2010-02-12 9:57 ` Sebastian Andrzej Siewior
2010-02-14 20:42 ` Sebastian Andrzej Siewior
2010-02-15 0:10 ` Herbert Xu
2010-02-15 8:49 ` Sebastian Andrzej Siewior
2010-02-16 12:51 ` Herbert Xu
2010-02-21 20:01 ` Sebastian Andrzej Siewior
2010-02-22 0:45 ` Herbert Xu
2010-02-22 0:52 ` Herbert Xu
2010-02-22 22:08 ` Sebastian Andrzej Siewior
2010-02-23 0:32 ` Herbert Xu
2010-03-14 8:24 ` Sebastian Andrzej Siewior
2010-03-14 9:06 ` Herbert Xu
[not found] ` <Pine.LNX.4.64.1002221400090.31819@hs20-bc2-1.build.redhat.com>
2010-02-23 0:15 ` Herbert Xu
2010-01-26 12:59 ` [dm-devel] [PATCH] dm-crypt: disable block encryption with arc4 Alasdair G Kergon
2010-01-25 18:39 ` Mikulas Patocka
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