Junichi Tomida

I am a researcher of cryptography at NTT, Japan. I am mainly working on public-key cryptosystems.

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Degree

Publications

Conference Papers

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 Papers

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.

Invited Talks

  • Unbounded Inner Product Functional Encryption from Bilinear Maps

WCIS 2019

Domestic Workshops

  • データベースの等結合後に加重合計を求める秘密計算プロトコル

Junichi Tomida, Masanobu Kii, Koki Hamada, Atsunori Ichikawa, Koji Chida. SCIS2022

  • 緊密安全な内積関数型暗号

Junichi Tomida. SCIS 2019.

  • (アリティに制限を持たない)関数秘匿複数入力内積関数型暗号

Pratish Datta, Tatsuaki Okamoto, Junichi Tomida. SCIS 2018.

  • より弱い仮定に基づく効率的な完全秘匿性を持つ内積値暗号

Junichi Tomida, Masayuki Abe, Tatsuaki Okamoto. SCIS 2017.

  • Adaptively Secure Functional Encryption for Inner-Product Values

Junichi Tomida, Masayuki Abe, Tatsuaki Okamoto. SCIS 2016.

Awards

  • SCIS 2018 Paper Award