特許権 Signature generation apparatus, signature verification apparatus, method thereof, and integrated circuit Yuichi Futa, Shingo Hasagawa, Shuji Isobe, Motoji Ohmori, Hiroki Shizuya 出願番号 JP4620669B2, CN1954548B, US20090235078A1, WO2006115021A1 出願日 2006年