Re: [PATCH 07/10] password: add pbkdf2 support

[Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>]

On 11:49 Mon 16 Mar     , Jan Lübbe wrote:
> On Mo, 2015-03-16 at 11:15 +0100, Jean-Christophe PLAGNIOL-VILLARD wrote:
> > We will use "barebox_password" as salt and 10000 round to generate a
> > 64 bytes key.
> 
> The purpose of a salt is to protect a against dictionary or
> rainbow-table (precomputed) attacks. That means that the Salt must be
> randomly generated and saved with the password.
This will be a enough stong enven with static one to protect against
reverse hack for barebox protection

Use a 32 byte pass try to do an attack agaist dictionary.
it will take you more than 10 years to break it
> 
> For setting a new password in barebox, even a low entropy salt will make
> attacks significantly more expensive. So we should add some entropy from
> user interaction timing in that case.
yes we could do this too
> 
> For hashing a password at compile time, we should get the salt from the
> host system.
yes

do we really need it?

Best Regards,
J.
> 
> Regards,
> Jan
> -- 
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