1. Kazuto Matsuo, Jinhui Chao, and Shigeo Tsujii, An improved baby step giant step algorithm for point counting of hyperelliptic curves over finite fields, Algorithmic Number Theory (Sydney, 2002), Lecture Notes in Comput. Sci., vol. 2369, Springer, Berlin, 2002, pp. 461–474.[MR]
  2. Shigeo Tsujii, Kohtaro Tadaki, and Ryou Fujita, Proposal for piece in hand matrix: General concept for enhancing security of multivariate public key cryptosystems, IEICE Trans A: Fundamentals E90-A (2007), no. 5, 992-999.[doi]
  3. Shigeo Tsujii, Kohtaro Tadaki, and Ryou Fujita, Nonlinear piece-in-hand matrix method for enhancing security of multivariate public key cryptosystems, IACR (2008).[eprint]
  4. Shigeo Tsujii, Kohtaro Tadaki, Masahito Gotaishi, Ryo Fujita, and Masao Kasahara, Proposal of PPS multivariate public key cryptosystems, IACR (2009), 21 pages.[eprint]