Vicente Benjumea Seung Geol Choi Javier Lopez Moti Yung Anonymity 2.0 - X.509 Extensions Supporting Privacy-Friendly Authentication. 265-281 2007 conf/cans/2007 CANS http://dx.doi.org/10.1007/978-3-540-76969-9_17 db/conf/cans/cans2007.html#BenjumeaCLY07