Mira Belenkiy Melissa Chase Markulf Kohlweiss Anna Lysyanskaya P-signatures and Noninteractive Anonymous Credentials. 356-374 2008 TCC http://dx.doi.org/10.1007/978-3-540-78524-8_20 conf/tcc/2008 db/conf/tcc/tcc2008.html#BelenkiyCKL08