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

coderman coderman at
Sun Jul 15 20:53:45 PDT 2012

On Sun, Jul 15, 2012 at 1:52 PM, Seth David Schoen <schoen at> wrote:
> ...  Wei et al. say from experiments that overwriting
> free space is _not_ very effective.
> ...  They say that "[t]he SSDs
> we tested contain between 6 and 25% more physical flash storage than they
> advertise as their logical capacity".

the only rational approach is to use Full Disk(Flash) Encryption.

then secure wipe becomes zeroisation of the disk encryption key, which
renders the storage entropy.

secure key management is another tangent, for which secure deletion
rears its ugly head again...

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