Kouichi Sakurai Tsuyoshi Takagi New Semantically Secure Public-Key Cryptosystems from the RSA-Primitive. 1-16 2002 conf/pkc/2002 Public Key Cryptography http://link.springer.de/link/service/series/0558/bibs/2274/22740001.htm db/conf/pkc/pkc2002.html#SakuraiT02