54 citations · 69 across the 9 of their papers we have counts for
5 papers · 1 filter
Security Formalizations and Their Relationships for Encryption and Key Agreement in Information-Theoretic Cryptography
Mitsugu Iwamoto, Kazuo Ohta, Junji Shikata
This paper revisits formalizations of information-theoretic security for symmetric-key encryption and key agreement protocols which are very fundamental primitives in cryptography.…
Secret Sharing Schemes Based on Min-Entropies
Mitsugu Iwamoto, Junji Shikata
Fundamental results on secret sharing schemes (SSSs) are discussed in the setting where security and share size are measured by (conditional) min-entropies. We first formalize a un…
Security Notions for Information Theoretically Secure Encryptions
Mitsugu Iwamoto, Kazuo Ohta
This paper is concerned with several security notions for information theoretically secure encryptions defined by the variational (statistical) distance. To ensure the perfect secr…
Strongly secure ramp secret sharing schemes for general access structures
Mitsugu Iwamoto, Hirosuke Yamamoto
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…
Optimal multiple assignments based on integer programming in secret sharing schemes with general access structures
Mitsugu Iwamoto, Hirosuke Yamamoto, Hirohisa Ogawa
It is known that for any general access structure, a secret sharing scheme (SSS) can be constructed from an (m,m)-threshold scheme by using the so-called cumulative map or from a (…