Junji Shikata Goichiro Hanaoka Yuliang Zheng Hideki Imai Security Notions for Unconditionally Secure Signature Schemes. 434-449 2002 conf/eurocrypt/2002 EUROCRYPT http://dx.doi.org/10.1007/3-540-46035-7_29 db/conf/eurocrypt/eurocrypt2002.html#ShikataHZI02