Publications

See also My DBLP, My researchmap, and my CV.

[Peer-Reviewed Journal Articles]

Key-Updatable Public-Key Encryption with Keyword Search (Or: How to Realize PEKS with Efficient Key Updates for IoT Environments)
with Hiroaki Anada, Akira Kanaoka, and Natsume Matsuzaki
International Journal of Information Security.
Preliminary version in ACISP 2018.

Multi-Party Computation for Modular Exponentiation based on Replicated Secret Sharing
with Kazuma Ohara, Mitsugu Iwamoto, and Kazuo Ohta
IEICE Trans, 2019.

Implementation and Analysis of Fully Homomorphic Encryption in Resource-Constrained Devices
with Amonrat Prasitsupparote, Junichi Sakamoto, Junji Shikata, and Tsutomu Matsumoto
International Journal of Digital Information and Wireless Communications.
Preliminary version in ISDF 2018.

Identity-based Encryption with Hierarchical Key-insulation in the Standard Model
with Junji Shikata
Designs, Codes and Cryptography.
Preliminary version in PKC 2016.

Timed-Release Computational Secret Sharing and Threshold Encryption
with Junji Shikata
Designs, Codes and Cryptography, 2018.
Preliminary version in ProvSec 2014.

CCA-secure Revocable Identity-based Encryption Schemes with Decryption Key Exposure Resistance
with Yuu Ishida and Junji Shikata
International Journal of Applied Cryptography, 2017.
Preliminary version in ACISP 2015.

Information-Theoretically Secure Timed-Release Secret Sharing Schemes
with Junji Shikata
Journal of Information Processing, 2016.
Preliminary version in BalkanCryptSec 2014.

Unconditionally Secure Broadcast Encryption Schemes with Trade-offs between Communication and Storage
with Junji Shikata
IEICE Transactions, 2016.
Preliminary version in ProvSec 2015.

[Peer-Reviewed Conference Papers]

Identity-Based Encryption with Security against the KGC: A Formal Model and Its Instantiation from Lattices
with K. Emura and Shuichi Katsumata
In ESORICS, 2019.

Implementation and Analysis of Fully Homomorphic Encryption in Wearable Devices
with Amonrat Prasitsupparote and Junji Shikata
In ISDF, 2018.

Card-Based Majority Voting Protocols with Three Inputs Using Three Cards
with Yoshihisa Kuroki, Shinnosuke Suzuki, Yuta Koga, Mitsugu Iwamoto, and Kazuo Ohta
In ISITA, 2018.
Received IEEE ITSJC Young Researcher Best Paper Award.

Key-updatable Public-key Encryption with Keyword Search: Models and Generic Constructions
with Hiroaki Anada, Akira Kanaoka, and Natsume Matsuzaki
In ACISP, 2018.

Broadcast Encryption with Guessing Secrecy
In ICITS, 2017.

Lattice-based Revocable Identity-based Encryption with Bounded Decryption Key Exposure Resistance
with Atsushi Takayasu
In ACISP, 2017.
[eprint]

Unconditionally Secure Searchable Encryption
with Takahiro Yoshizawa and Junji Shikata
In CISS, 2017.

New Revocable IBE in Prime-Order Groups: Adaptively Secure, Decryption Key Exposure Resistant, and with Short Public Parameters
with Keita Emura and Jae Hong Seo
In CT-RSA, 2017.
[eprint]

Unconditionally Secure Revocable Storage: Tight Bounds, Optimal Construction, and Robustness
with Goichiro Hanaoka and Junji Shikata
In ICITS, 2016.
[eprint]

Sequential Aggregate Authentication Codes with Information Theoretic Security
with Shinichiro Tomita and Junji Shikata
In CISS, 2016.

Identity-based Hierarchical Key-insulated Encryption without Random Oracles
with Junji Shikata
In PKC, 2016.
[eprint]

Constructions of Unconditionally Secure Broadcast Encryption from Key Predistribution Systems with Trade-offs between Communication and Storage
with Junji Shikata
In ProvSec, 2015.

Keyword Revocable Searchable Encryption with Trapdoor Exposure Resistance and Re-generateability
with Keita Emura and Le Trieu Phong
In IEEE TrustCom, 2015.

Constructions of CCA-secure Revocable Identity-based Encryption
with Yuu Ishida and Junji Shikata
In ACISP, 2015.
Invited to International Journal on Applied Cryptography.

Information-Theoretically Secure Blind Authentication Codes without Verifier’s Secret Keys
with Noriyasu Takei and Junji Shikata
In Annual Workshop on Statistical Science and Related Topics, 2015.
Preliminary version in 3rd ISEEE.

Timed-Release Secret Sharing Schemes with Information Theoretic Security
with Junji Shikata
In BalkanCryptSec, 2014.
[eprint]

Timed-Release Computational Secret Sharing Scheme and Its Applications
with Junji Shikata
In ProvSec, 2014.

Information-Theoretically Secure Anonymous Group Authentication with Arbitration: Formal Definition and Construction
with Takenobu Seito, Kazuyuki Kinose, and Junji Shikata
In Annual Workshop on Mathematics and Computer Science, 2014.
Preliminary version in 3rd ISEEE.

Information-Theoretically Secure Entity Authentication in the Multi-user Setting
with Shogo Hajime and Junji Shikata
In ICISC, 2013.

Unconditionally Secure Blind Authentication Codes in the Manual Channel Model
with Noriyasu Takei and Junji Shikata
In 3rd ISEEE, 2013.

Unconditionally Secure Anonymous Group Authentication with an Arbiter
with Takenobu Seito, Kazuyuki Kinose, and Junji Shikata
In 3rd ISEEE, 2013.

Information-Theoretically Secure Aggregate Authentication Code: Model, Bounds, and Constructions
with Asato Kubai and Junji Shikata
In MoCrySEn,2013.

Information-Theoretic Timed-Release Security: Key-Agreement, Encryption and Authentication Codes
with Takenobu Seito and Junji Shikata
In ICITS, 2012.
[eprint]

[Dissertation]

Cryptography with Timed Access Control
Graduate School of Environment and Information Sciences, Yokohama National University, Japan, March 2016.
Supervisor: Asso. Prof. Dr. Junji Shikata

[Non Peer-Reviewed International Posters]

How to Provide Long-term Security and Required Functionality for Cloud Storage
with Goichiro Hanaoka and Junji Shikata
In Yokohama Environment and Information Sciences (YEIS) International Forum, Yokohama, Japan, 2015.

Constructions of Strongly Secure Revocable Identity-based Encryption
with Yuu Ishida and Junji Shikata
In Yokohama Environment and Information Sciences (YEIS) International Forum, Yokohama, Japan, 2015.

How to Provide Long-term Security and Required Functionality for Cloud Storage
with Goichiro Hanaoka and Junji Shikata
In PRIVAGEN, Tokyo, Japan, 2015.

Information-Theoretically Secure Revocable-Storage Broadcast Encryption
with Junji Shikata
In IWSEC, Hirosaki, Japan, 2014.
Received Best Poster Award.

[Invited Talks]

Unconditionally Secure Revocable Storage
In IWSEC, Nara, Japan, 2015.

Timed-Release Cryptography -Two Theoretical Approaches to Achieve Security
In JSPS-DST Asian Academic Seminar, Tokyo, Japan, 2013.

[Awards and Honers]

CSS 2019 Encouragement Research Award, 2019.

IEEE Information Theory Society Japan Chapter Young Researcher Best Paper Award, 2018.

CSS 2018 Best Paper Award, 2018.

Invitation to 4th Heidelberg Laureate Forum, 2016.

SCIS Paper Award, 2016.

JSPS Research Fellowship for Young Scientists (PD), 2016–2019.

CSS 2014 Student Paper Award, 2014.

IWSEC 2014 Best Poster Award, 2014.

JSPS Research Fellowship for Young Scientists (DC1), 2013–2016.