Kunihiko Miyazaki Goichiro Hanaoka Hideki Imai Invisibly Sanitizable Digital Signature Scheme. 392-402 2008 91-A IEICE Transactions 1 http://dx.doi.org/10.1093/ietfec/e91-a.1.392 db/journals/ieicet/ieicet91a.html#MiyazakiHI08