[Barker, Elaine B.] NIST Publication Announcements

Perry E. Metzger perry at piermont.com
Tue Sep 29 10:31:01 EDT 2009

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.


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