Masanobu Katagi Toru Akishita Izuru Kitamura Tsuyoshi Takagi Some Improved Algorithms for Hyperelliptic Curve Cryptosystems Using Degenerate Divisors. 296-312 2004 conf/icisc/2004 ICISC http://dx.doi.org/10.1007/11496618_22 db/conf/icisc/icisc2004.html#KatagiAKT04