Alfredo Rial Markulf Kohlweiss Bart Preneel Universally Composable Adaptive Priced Oblivious Transfer. 231-247 2009 Pairing http://dx.doi.org/10.1007/978-3-642-03298-1_15 conf/pairing/2009 db/conf/pairing/pairing2009.html#RialKP09