[Barker, Elaine B.] NIST Publication Announcements

[Steven Bellovin]

On Sep 29, 2009, at 10:31 AM, Perry E. Metzger wrote:

>
> Stephan Neuhaus <neuhaus at st.cs.uni-sb.de> writes:
>> For business reasons,
>> Alice can't force Bob to use a particular TTA, and it's also
>> impossible to stipulate a particular TTA as part of the job
>> description (the reason is that Alice and the Bobs----great band name
>> BTW---won't agree to trust any particular TTA and also don't want to
>> operate their own).
>
> You don't need such a complicated description -- you're just asking  
> "can
> I do secure timestamping without requiring significant trust in the
> timestamping authority."
>
> The Haber & Stornetta scheme provides a timestamping service that
> doesn't require terribly much trust, since hard to forge widely
> witnessed events delimit particular sets of timestamps. The only issue
> is getting sufficient granularity.


I don't know if their scheme was patented in Germany.  It was in the  
U.S., though I think that at least some of the patents expire within  
the year.

		--Steve Bellovin, http://www.cs.columbia.edu/~smb





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