Goichiro Hanaoka Hideki Imai Kazuto Ogawa Hajime Watanabe Chosen Ciphertext Secure Public Key Encryption with a Simple Structure. 20-33 2008 IWSEC http://dx.doi.org/10.1007/978-3-540-89598-5_2 conf/iwsec/2008 db/conf/iwsec/iwsec2008.html#HanaokaIOW08