[19779] in cryptography@c2.net mail archive
Re: thoughts on one time pads
daemon@ATHENA.MIT.EDU (Dave Howe)
Sat Jan 28 12:36:54 2006
X-Original-To: cryptography@metzdowd.com
X-Original-To: cryptography@metzdowd.com
Date: Sat, 28 Jan 2006 16:58:41 +0000
From: Dave Howe <DaveHowe@gmx.co.uk>
To: cryptography@metzdowd.com
In-Reply-To: <43DA751B.3000008@av8n.com>
John Denker wrote:
> Dave Howe wrote:
>
>> Hmm. can you selectively blank areas of CD-RW?
>
>
> Sure, you can. It isn't soooo much different from rewriting any
> other type of disk.
Yeah, I know. just unsure how effective blanking is on cd-rw for (say) a pattern
that has been in residence for two years, but now must be unrecoverable.
> There are various versions of getting rid of a disk file.
> 5) Grinding the disk to dust. AFAIK this is the only NSA-approved
> method. A suitable grinder costs about $1400.00.
> http://cdrominc.com/product/1104.asp
for most, scratching off the carrier substrate is usually enough - I *might* be
persuaded some trace remains on the plastic disc afterwards, but I can't imagine
anyone recovering from a disk that had been
a) scraped clean then
b) thrown into a blast furnace containing liquid iron, or even a small home smelter.
However, I am more interested in methods to destroy just a single track at a
time, and I doubt you could deface the disk reliably *and* still retain read
abilty on the remaining tracks.
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