[12088] in cryptography@c2.net mail archive
Re: 'E-postmark' gives stamp of approval
daemon@ATHENA.MIT.EDU (Sean Smith)
Wed Nov 27 12:05:48 2002
To: "R. A. Hettinga" <rah@shipwright.com>
Cc: Digital Bearer Settlement List <dbs@philodox.com>,
cryptography@wasabisystems.com
In-Reply-To: Your message of "Wed, 27 Nov 2002 09:07:15 EST."
<p05200f3aba0a81e246bb@[66.149.49.6]>
From: Sean Smith <sws@cs.dartmouth.edu>
Reply-To: Sean Smith <sws@cs.dartmouth.edu>
Date: Wed, 27 Nov 2002 12:01:44 -0500
Back when I first heard about this idea (a long time ago),
I wondered two things:
1. What about Haber and Stornetta's work (and patents)?
2. What's to stop me from setting up "Sean's Discount Postmark Service,"
where, each time unit, I collect document hashes from customers,
build a hash tree, and buy a USPS postmark for the root of the tree?
--Sean
--
Sean W. Smith, Ph.D. sws@cs.dartmouth.edu
http://www.cs.dartmouth.edu/~sws/ (has ssl link to pgp key)
Department of Computer Science, Dartmouth College, Hanover NH USA
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