International Association for Cryptologic Research

International Association
for Cryptologic Research

CryptoDB

Yuichi Komano

Publications

Year
Venue
Title
2004
EPRINT
Efficient Universal Padding Schemes for Multiplicative Trapdoor One-way Permutation
Yuichi Komano Kazuo Ohta
Coron et al. proposed the ES-based scheme PSS-ES which realizes an encryption scheme and a signature scheme with a unique padding scheme and key pair. The security of PSS-ES as an encryption scheme is based on the \textit{partial-domain one-wayness} of the encryption permutation. In this paper, we propose new ES schemes OAEP-ES, OAEP++-ES, and REACT-ES, and prove their security under the assumption of \textit{only} the \textit{one-wayness} of encryption permutation. OAEP-ES, OAEP++-ES, and REACT-ES suit practical implementation because they use the same padding technique for encryption and for signature, and their security proof guarantees that we can prepare one key pair to realize encryption and signature in the same way as PSS-ES. Since \textit{one-wayness} is a weaker assumption than \textit{partial-domain one-wayness}, the proposed schemes offer tighter security than PSS-ES. Hence, we conclude that OAEP-ES, OAEP++-ES, and REACT-ES are more effective than PSS-ES. OAEP++-ES is the most practical approach in terms of the tightness of security and communication efficiency.
2003
CRYPTO

Program Committees

CHES 2017

Coauthors

Kazuo Ohta (2)