Efficient Private Techniques for Verifying Social Proximity.

Michael J. Freedman Antonio Nicolosi Efficient Private Techniques for Verifying Social Proximity. 2007 IPTPS http://www.iptps.org/papers-2007/FreedmanNicolosi.pdf conf/iptps/2007 db/conf/iptps/iptps2007.html#FreedmanN07