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Date: Fri, 22 Jun 2012 10:32:42 +0200
From: Per Thorsheim <per@...rsheim.net>
To: "john-dev@...ts.openwall.com" <john-dev@...ts.openwall.com>
Cc: "john-dev@...ts.openwall.com" <john-dev@...ts.openwall.com>
Subject: Re: Re: EPiServer format fails on 32-bit builds.
Gentlemen;
Do not be afraid of looking at the hashcat thread on episerver: http://hashcat.net/forum/thread-987.html?highlight=Episerver for info.
Twitter: @skradel & @klingsen have made blog posts about this stuff, and Troy Hunt (troyhunt.com) is working on something as well.
Best regards,
Per Thorsheim
Den 22. juni 2012 kl. 10:19 skrev Frank Dittrich <frank_dittrich@...mail.com>:
> On 06/22/2012 10:03 AM, Dhiru Kholia wrote:
>> 18 is the upper bound. I will fix my source to use this upper bound.
>
> 18 is the upper bound only if the base64 encoded salt is not longer than
> 24 characters.
> Since valid() doesn't verify this, if is still possible to break this
> format.
> I am, however, not sure if valid() should reject hashes if the base64
> encoded salt is longer than 24 characters, or if the format should be
> able to handle a larger salt size (and if so, which one).
>
> Googling for "aspnet_membership passwordformat" I found this link:
>
> http://msdn.microsoft.com/en-us/library/aa478949.aspx
>
> Not sure if this also applies to episerver.
> But
>
> PasswordSalt
> nvarchar(128)
> Randomly generated 128-bit value used to salt password hashes; stored in
> base-64-encoded form
>
> generates more confusion than it clarifies anything.
> 128 characters, bytes, or bits?
> Before or after base64 encoding?
> No idea.
>
> Frank
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