Stuart E. Schechter, Serge Egelman, Robert W. Reeder. It s not what you know, but who you know: a social approach to last-resort authentication. In Dan R. Olsen Jr., Richard B. Arthur, Ken Hinckley, Meredith Ringel Morris, Scott E. Hudson, Saul Greenberg, editors, Proceedings of the 27th International Conference on Human Factors in Computing Systems, CHI 2009, Boston, MA, USA, April 4-9, 2009. pages 1983-1992, ACM, 2009. [doi]
Abstract is missing.