Security Enhancement of Various MPKCs by 2-Layer Nonlinear Piece in Hand Method

Shigeo TSUJII; Kohtaro TADAKI; Ryou FUJITA; Masahito GOTAISHI; Toshinobu KANEKO

doi:10.1587/transfun.E92.A.2438

Special Section on Information Theory and Its Applications

Security Enhancement of Various MPKCs by 2-Layer Nonlinear Piece in Hand Method

Shigeo TSUJII, Kohtaro TADAKI, Ryou FUJITA, Masahito GOTAISHI, Toshinobu KANEKO

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Keywords: public key cryptosystem, multivariate public key cryptosystem, Piece in Hand, multivariate polynomial

JOURNAL RESTRICTED ACCESS

2009 Volume E92.A Issue 10 Pages 2438-2446

DOI https://doi.org/10.1587/transfun.E92.A.2438

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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.

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