Keita Xagawa

Post-Quantum Provably-Secure Authentication and MAC from Mersenne Primes.

2019

This paper presents a novel, yet efficient secret-key authentication and MAC, which provide post-quantum security promise, whose security is reduced to the quantum-safe conjectured hardness of Mersenne Low Hamming Combination (\(\mathsf {MERS}\)) assumption recently introduced …

Efficient RKA-secure KEM and IBE schemes against invertible functions

2015

We propose efficient KEM and IBE schemes secure under the related-key attacks RKAs against almost all invertible related-key derivation RKD functions under the DBDH assumption. The class of RKD functions we consider is broader than …

Non-Committing Encryption with Constant Ciphertext Expansion from Standard Assumptions.

2020

Non-committing encryption (NCE) introduced by Canetti et al. (STOC ’96) is a central tool to achieve multi-party computation protocols secure in the adaptive setting. Recently, Yoshida et al. (ASIACRYPT ’19) proposed an NCE scheme based …