研究成果

国際会議

  • Strongly Secure Ramp Secret Sharing Schemes
    著者
    M. Iwamoto and H. Yamamoto
    会議名
    IEEE ISIT 2005
    ページ
    1221–1225
    出版社
    IEEE
    発行年
    2021
    発表日
    Sep. 4–9, 2005
    Abstract

    Ramp secret sharing (SS) schemes can be classified into strong ramp SS schemes and weak ramp SS schemes. The strong ramp SS schemes do not leak out any part of a secret explicitly even in the case where some information about the secret leaks from a non-qualified set of shares, and hence, they are more desirable than weak ramp SS schemes. However, it is not known how to construct the strong ramp SS schemes in the case of general access structures. In this paper, it is shown that a strong ramp SS scheme can always be constructed from a SS scheme with plural secrets for any feasible general access structure. As a byproduct, it is pointed out that threshold ramp SS schemes based on Shamir's polynomial interpolation method are not always strong.