Akihiro Mihara Keisuke Tanaka Universal Designated-Verifier Signature with Aggregation. 514-519 2005 conf/icita/2005 ICITA (2) http://doi.ieeecomputersociety.org/10.1109/ICITA.2005.293 db/conf/icita/icita2005-2.html#MiharaT05