[dm-crypt] security: improve defaults

Sitaram Chamarty sitaramc at gmail.com
Sat Jan 3 09:19:00 CET 2015


On 01/03/2015 11:30 AM, Arno Wagner wrote:
> On Sat, Jan 03, 2015 at 00:18:21 CET, Christian Stadelmann wrote:

>> cipher: aes-cbc-essiv (default in plain mode)
>> There are known attacs against aes-cbc-essiv which lead to using aes-xts
>> as default cipher in LUKS mode. Is there any reason why it should not be
>> used in plain mode?
> 
> Simple: Backwards compatibility. As plain mode does not
> have a header, this would break old uses. Anybody that wants
> it can already use XTS.

seconded; I rely on this -- please don't change this :-)

Christian: anyone who is using dm-crypt in plain mode *already* knows
what he is doing.  If they don't, they should not be using plain mode.
There is no need for you or me to worry about them, in my opinion.


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