[144916] in cryptography@c2.net mail archive
Re: [Barker, Elaine B.] NIST Publication Announcements
daemon@ATHENA.MIT.EDU (Stephan Neuhaus)
Fri Oct 2 13:25:24 2009
Cc: Peter Gutmann <pgut001@cs.auckland.ac.nz>,
cryptography@metzdowd.com
From: Stephan Neuhaus <neuhaus@st.cs.uni-sb.de>
To: "Perry E. Metzger" <perry@piermont.com>
In-Reply-To: <87vdizjhog.fsf@snark.cb.piermont.com>
Date: Thu, 1 Oct 2009 17:07:46 +0200
On Oct 1, 2009, at 16:46, Perry E. Metzger wrote:
> It is also completely impossible to prove you've deleted a
> record. Someone who can read the record can always make a copy of
> it. Cryptography can't fix the DRM problem.
Sorry, I should have clarified that. We don't want to verify that Bob
has in fact deleted the patient record, we just want to verify whether
Bob *claims* to have deleted the patient record *within the time span
given*. If Alice later finds out that Bob has lied, she will have this
signed claim, with which she can take him to court.
Best,
Stephan
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