changeset 1411:b4ed28fc63d5

doc: described Nordic Sugar application
author Thomas P Jakobsen <>
date Mon, 14 Dec 2009 10:30:24 +0100
parents bceda78b1358
children cf1d7d3eab0a
files doc/applications.txt
diffstat 1 files changed, 43 insertions(+), 1 deletions(-) [+]
line wrap: on
line diff
--- a/doc/applications.txt	Thu Dec 10 22:48:38 2009 +0100
+++ b/doc/applications.txt	Mon Dec 14 10:30:24 2009 +0100
@@ -11,7 +11,49 @@
 Nordic Sugar
+In Denmark, the production of sugarbeet is managed by sugarbeet
+contracts. A sugarbeet contract determines the quantity of sugarbeet
+that a farmer is allowed to produce. Traditionally, sugarbeet
+contracts have been traded between individual pairs of farmers. This
+has been done in spite of the fact that trading in a central market
+was known to increase the overall profit. A central market has,
+however, not been possible due to conflicting interests and lack of
+trust between the parties.
+In January 2008 the first large scale secure multiparty computation
+was carried out, effectively solving this problem. This was done by
+the SIMAP research project as reported in "`Multiparty Computation
+Goes Live`__" (also published at `Financial Crypto 2009`__). In the
+summer of 2009 the same computation was successfully repeated, this
+time using VIFF.
+.. __:
+.. __:
+The computation was a double auction in which the production rights
+for several thousand tons of sugarbeets were traded. During the first
+weeks of the auction, several hundred Danish sugarbeet farmers
+submitted their encrypted bids to a central database. Then the actual
+computation took place between three players:
+* Nordic Sugar, the Danish sugar company
+* DKS, the consolidation of Danish sugarbeet farmers
+* Partisia, a Danish company specialized in secure multiparty
+  solutions
+The computation took about 15 minutes using three laptops on a LAN.
+Most of the computation time was spend converting the encrypted bids
+to secret sharings. The actual multiparty computation took only a
+couple of minutes. As a result, the sugarbeet contracts could be
+traded at an optimal price without any sensitive information being
+Using secure multiparty computation, trading sugarbeets using this
+kind of auction was possible without finding and paying a trusted
+third party to manage the auction. Such a trusted party would---if it
+could be found at all---probably have been quite expensive.
 Distributed RSA