Conference Papers
2024
A Modular Approach to Registered ABE for Unbounded Predicates
Nuttapong Attrapadung, Junichi Tomida. CRYPTO 2024
2023
Secure Statistical Analysis on Multiple Datasets: Join and Group-By
Gilad Asharov, Koki Hamada, Ryo Kikuchi, Ariel Nof, Benny Pinkas, Junichi Tomida. ACM CCS 2023
Communication-Efficient Inner Product Private Join and Compute with Cardinality
Koji Chida, Koki Hamada, Atsunori Ichikawa, Masanobu Kii, Junichi Tomida. AsiaCCS2023
Attribute-Based Multi-input FE (and More) for Attribute-Weighted Sums
Shweta Agrawal, Junichi Tomida, Anshu Yadav. CRYPTO2023
Unbounded Quadratic Functional Encryption and More from Pairings
Junichi Tomida. EUROCRYPT2023
Making the Identity-Based Diffie-Hellman Key Exchange Efficiently Revocable
Kohei Nakagawa, Atsushi Fujioka, Akira Nagai, Junichi Tomida, Keita Xagawa, Kan Yasuda. LATINCRYPT2023
2022
Efficient Secure Three-Party Sorting with Applications to Data Analysis and Heavy Hitters
Gilad Asharov, Koki Hamada, Dai Ikarashi, Ryo Kikuchi, Ariel Nof, Benny Pinkas, Katsumi Takahashi, Junichi Tomida. ACM CCS 2022
Multi-Input Quadratic Functional Encryption: Stronger Security, Broader Functionality
Shweta Agrawal, Rishab Goyal, Junichi Tomida. TCC 2022
2021
Revocable Hierarchical Identity-Based Authenticated Key Exchange
Yuki Okano, Junichi Tomida, Akira Nagai, Kazuki Yoneyama, Atsushi Fujioka, Koutarou Suzuki. ICISC 2021
Multi-Party Functional Encryption
Shweta Agrawal, Rishab Goyal, Junichi Tomida. TCC 2021.
Multi-Input Quadratic Functional Encryption from Pairings
Shweta Agrawal, Rishab Goyal, Junichi Tomida. CRYPTO 2021.
2020
Unbounded Dynamic Predicate Compositions in ABE from Standard Assumptions
Nuttapong Attrapadung, Junichi Tomida. ASIACRYPT 2020.
Fast, Compact, and Expressive Attribute-Based Encryption.
Junichi Tomida, Yuto Kawahara, Ryo Nishimaki. PKC 2020.
2019
Tightly Secure Inner Product Functional Encryption: Multi-Input and Function-Hiding Constructions
Junichi Tomida. ASIACRYPT 2019.
Strongly Secure Identity-Baed Key Exchange with Single Pairing Operation
Junichi Tomida, Atsushi Fujioka, Akira Nagai, Koutarou Suzuki. ESORICS 2019.
2018
Unbounded Inner Product Functional Encryption from Bilinear Maps
Junichi Tomida, Katsuyuki Takashima. ASIACRYPT 2018.
Full-Hiding (Unbounded) Multi-input Inner Product Functional Encryption from the k-Linear Assumption
Pratish Datta, Tatsuaki Okamoto, Junichi Tomida. PKC 2018.
2016
Efficient Functional Encryption for Inner-Product Values with Full-Hiding Security
Junichi Tomida, Masayuki Abe, Tatsuaki Okamoto. ISC 2016.
Journal Articles
2021
Fast, Compact, and Expressive Attribute-Based Encryption
Junichi Tomida, Atsushi Fujioka, Akira Nagai, Koutarou Suzuki. Designs, Codes and Cryptography 2021.
Strongly Secure Identity-Baed Key Exchange with Single Pairing Operation
Junichi Tomida, Atsushi Fujioka, Akira Nagai, Koutarou Suzuki. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. 2021.
2020
Efficient Inner Product Functional Encryption with Full-Hiding Security
Junichi Tomida, Masayuki Abe, Tatsuaki Okamoto. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. 2020.
Unbounded Inner Product Functional Encryption from Bilinear Maps
Junichi Tomida, Katsuyuki Takashima. Japan Journal of Industrial and Applied Mathematics 2020.
Tightly secure inner product functional encryption: Multi-input and function-hiding constructions
Junichi Tomida, Theoretical Computer Science 2020.