Ivan Damgård Martin Geisler Mikkel Krøigaard Efficient and Secure Comparison for On-Line Auctions. 416-430 2007 conf/acisp/2007 ACISP http://dx.doi.org/10.1007/978-3-540-73458-1_30 db/conf/acisp/acisp2007.html#DamgardGK07