Yong Li 0002 Willy Susilo Yi Mu Dingyi Pei Designated Verifier Signature: Definition, Framework and New Constructions. 1191-1200 2007 conf/uic/2007 UIC http://dx.doi.org/10.1007/978-3-540-73549-6_116 db/conf/uic/uic2007.html#LiSMP07