[16359] in cryptography@c2.net mail archive
Re: Printers betray document secrets
daemon@ATHENA.MIT.EDU (Ben Laurie)
Mon Oct 25 16:41:12 2004
X-Original-To: cryptography@metzdowd.com
X-Original-To: cryptography@metzdowd.com
Date: Mon, 25 Oct 2004 16:23:14 +0100
From: Ben Laurie <ben@algroup.co.uk>
To: Marshall Clow <marshall@idio.com>
Cc: Bill Stewart <bill.stewart@pobox.com>, cryptography@metzdowd.com
In-Reply-To: <p0620053abd9d90eb0302@[129.46.153.119]>
Marshall Clow wrote:
> At 10:44 PM -0700 10/20/04, Bill Stewart wrote:
>
>> At 05:23 PM 10/18/2004, R.A. Hettinga wrote:
>>
>>> <http://news.bbc.co.uk/2/low/technology/3753886.stm>
>>
>>
>> It's not clear that they work at all with inkjet printers,
>> and changing ink cartridges is even more common than
>> changing laser printer cartridges. If you're sloppy,
>> you've probably got a bunch of partly-used cartridges around,
>> so even if you want to print out a bunch of ransom notes
>> or whatever, you don't even have to go to Kinko's
>> to get them to be different.
>
>
> If you're really concerned about this, buy a cheap inkjet,
> use it for your purposes, then destroy it.
This only works if the marks are not such that the identity of the
printer is linked to the marks (as opposed to being able to test whether
a particular document was produced by a particular printer).
To be really safe, I'd suggest going somewhere without surveillance
cameras, buying a printer for cash, using it and then destroying it.
Don't forget not to use your car and leave your mobile phone behind. Oh,
and take the RFID tags out of your clothes.
Cheers,
Ben.
--
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