Yuichi Komano Kazuo Ohta Atsushi Shimbo Shin-ichi Kawamura On the Security of Probabilistic Multisignature Schemes and Their Optimality. 132-150 2005 conf/mycrypt/2005 Mycrypt http://dx.doi.org/10.1007/11554868_10 db/conf/mycrypt/mycrypt2005.html#KomanoOSK05