Re: [liberationtech] Fwd: Re: secure wipe of flash memory

2012-07-16 Thread Nathan of Guardian
On 07/15/2012 11:53 PM, coderman wrote: > the only rational approach is to use Full Disk(Flash) Encryption. It is rational, but not possible on the majority of mobile phones (feature and smartphones), available today on the market. Our task with InTheClear was to come up with a practical way to t

Re: [liberationtech] Fwd: Re: secure wipe of flash memory

2012-07-15 Thread coderman
On Sun, Jul 15, 2012 at 1:52 PM, Seth David Schoen wrote: > ... Wei et al. say from experiments that overwriting > free space is _not_ very effective. > > https://www.usenix.org/events/fast11/tech/full_papers/Wei.pdf > > ... They say that "[t]he SSDs > we tested contain between 6 and 25% more ph

Re: [liberationtech] Fwd: Re: secure wipe of flash memory

2012-07-15 Thread Seth David Schoen
oli writes: > take the liberty... So I think there are a couple of interesting questions about how well you can clear flash storage by simple overwriting of free space. Remember that you have several layers in between your write operation and the actual flash blocks. Wei et al. say from experim

[liberationtech] Fwd: Re: secure wipe of flash memory

2012-07-15 Thread oli
take the liberty... -oli Original Message Subject: Re: [liberationtech] secure wipe of flash memory Date: Sun, 15 Jul 2012 11:17:59 -0400 From: Nathan To: oli Can't reply to list right now, but feel free to forward. Generally agree that encryption by default is the best ans