Cryptology ePrint Archive: Report 2009/061

Security Enhancement of Various MPKCs by 2-layer Nonlinear Piece In Hand Method

Shigeo Tsujii and Kohtaro Tadaki and Ryou Fujita and Masahito Gotaishi and Toshinobu Kaneko

Abstract: Following the last proposal of the nonlinear Piece in Hand method, which has 3-layer structure, 2-layer nonlinear Piece in Hand method is proposed. Both of them aim at enhancing the security of existing and future multivariate public key cryptosystems. The new nonlinear Piece in Hand is compared with the 3-layer method and PMI+, which was proposed by Ding, et al.

Category / Keywords: public-key cryptography / public key cryptosystem, multivariate public key cryptosystem, Piece In Hand, multivariate polynomial

Date: received 5 Feb 2009

Contact author: tsujii at iisec ac jp

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Version: 20090206:144048 (All versions of this report)

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