full-disclosure - Re: SSD and WDE

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Message-Id: <F14A9370-4AE2-45C4-BF63-6631CEF074A8@gmail.com>
Date: Sat, 18 Dec 2010 12:25:46 +1100
From: Abuse007 <abuse007@...il.com>
To: Paul Schmehl <pschmehl_lists@...rr.com>
Cc: "full-disclosure@...ts.grok.org.uk" <full-disclosure@...ts.grok.org.uk>
Subject: Re: SSD and WDE

Hi Paul,

I'm not aware if any, though I'm sure there are some. My understanding is that there shouldn't be any major issues with Full Disk Encryption on SSD. Modifying files might write the new data to a new physical sector, as part of wear levelling, leaving a copy of the old data in the old sector. This might provide some benefit to cryptanalysis. 

Compared to having a plaintext file system and then encrypting an existing file, which will possibly leave some or all of the plaintext behind due to wear levelling - FDE is much better.

On 18/12/2010, at 10:16 AM, Paul Schmehl <pschmehl_lists@...rr.com> wrote:

> I've spent some time Googling and haven't found anything I wasn't already 
> aware of.  I'm wondering if anyone is aware of any academic or technical 
> studies of whole disk encryption for solid state discs.  Any issues 
> uncovered that only apply to that specific combination and not to WDE in 
> general would be of great interest.  (I'm not interested in articles on the 
> cold boot attack.  I'm already familiar with that one.)
> 
> -- 
> Paul Schmehl, Senior Infosec Analyst
> As if it wasn't already obvious, my opinions
> are my own and not those of my employer.
> *******************************************
> "It is as useless to argue with those who have
> renounced the use of reason as to administer
> medication to the dead." Thomas Jefferson
> "There are some ideas so wrong that only a very
> intelligent person could believe in them." George Orwell
> 
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