日本語
The University of Electro-Communications 
Graduate School of Informatics and Engineering, School of Informatics and Engineering 
"Department of Informatics, Cluster II (Emerging Multi-interdisciplinary Engineering)" 

Assistant Professor 
WATANABE Yohei 

Personal website  
Personal website  

Career
Yokohama National University  JSPS Research Fellow (DC1)  2013/04-2016/03 
National Institute of Advanced Industrial Sciences and Technology  Research Institute for Secure Systems  Technical Trainee  2014/05-2015/03 
National Institute of Advanced Industrial Sciences and Technology  Information Technology Research Institute  Technical Trainee  2015/04-2016/03 
The University of Electro-Communications  JSPS Research Fellow (PD)  2016/04-2018/09 
National Institute of Advanced Industrial Sciences and Technology  Information Technology Research Institute  Collaborative Researcher  2016/04-2018/09 
National Institute of Information and Communications Technology  Security Fundamental Laboratory, Cybersecurity Research Institute  Researcher  2018/10-2019/11 
The University of Electro-Communications  Graduate School of Informatics and Engineering  Assistant Professor  2019/12-Present 
MEXT  Leading Initiative for Excellent Young Researchers  Excellent Young Researcher  2019/12-Present 
National Institute of Information and Communications Technology  Security Fundamental Laboratory, Cybersecurity Research Institute  Invited Advisor  2020/04-Present 
National Institute of Advanced Industrial Sciences and Technology  Cyber Physical Security Research Center  Collaborative Researcher  2020/04-Present 
Japan Datacom Co., Ltd.  Research Fellow  2020/08-Present 

Academic background
Yokohama National University  Faculty of Engineering  Department of Electronics and Information Engineering  2011/03  Graduated 
Yokohama National University  Graduate School of Environment and Information Sciences  Department of Information Media and Environment Sciences  Master's program  2013/03  Completed 
Yokohama National University  Graduate School of Environment and Information Sciences  Department of Information Media and Environment Sciences  Doctoral program  2016/03  Completed 

Academic degrees
Ph.D. in Information Science  Yokohama National University  2016/03/24 
M.S. in Engineering  Yokohama National University  2013/03/22 
B.S. in Engineering  Yokohama National University  2011/03/23 

Outlines of current research
My research interests include cryptography and information security, especially in creating more efficient/new cryptographic protocols in aspects of information-theoretic security and computational security. 

Classes responsible within the university
2021  Information Security Engineering Laboratory  Fall semester  Undergraduate, daytime 
2021  Cryptography  Fall semester  Undergraduate, daytime 
2021  Cryptography and Information Security  Fall semester  Undergraduate, mainly nighttime 
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Classes responsible in other universities
2018  Computer Literacy  Japan Women’s University 
2019  Computer Literacy  Japan Women’s University 
2019  Project Learning  Yokohama National University 
2020  Computer Literacy  Japan Women’s University 
2021  Computer Literacy  Japan Women’s University 
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Education and research activities in foreign countries
4th Heidelberg Laureate Forum招待・参加  2016/09-2016/09 
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Current research areas
Information security 

Research keywords
Cryptography 

Current research subjects
検索可能暗号の機能性,安全性,効率性向上に関する研究開発  2019/12-Present 
秘密情報の漏洩に耐性のある暗号技術の研究開発  2019/12-Present 
ニーズに即した高機能暗号技術の研究開発  2019/12-Present 

Published books
Book  Proceedings of the 5th ACM Asia Public-Key Cryptography Workshop (APKC 2018)  K. Emura, J.H. Seo, and Y. Watanabe  ACM  2018 
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Published papers
Paper  Yes  Efficient Identity-Based Encryption with Hierarchical Key-Insulation from HIBE  Joint  K. Emura, A. Takayasu, and Y. Watanabe  Designs, Codes and Cryptography  89/ 10, 2397-2431  2021  10.1007/s10623-021-00926-z 
Paper  Yes  Adaptively Secure Revocable Hierarchical IBE from k-linear Assumption  Joint  K. Emura, A. Takayasu, and Y. Watanabe  Designs, Codes and Cryptography  89/ 7, 1535-1574  2021 
Paper  Yes  Efficient Revocable Identity-based Encryption with Short Public Parameters  K. Emura, J.H. Seo, Y. Watanabe  Theoretical Computer Science  863, 127-155  2021 
Paper  Yes  Revocable Identity-based Encryption with Bounded Decryption Key Exposure Resistance: Lattice-based Construction and More  A. Takayasu and Y. Watanabe  Theoretical Computer Science  849, 64-98  2021 
Paper  Yes  Key-Updatable Public-Key Encryption with Keyword Search (Or: How to Realize PEKS with Efficient Key Updates for IoT Environments)  Joint  H. Anada, A. Kanaoka, N. Matsuzaki, and Y. Watanabe  International Journal of Information Security  19, 15-38  2020 
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Intellectual property rights
Patent  動的検索可能暗号処理システム及び動的検索可能暗号処理方法  2019-111977  2019/06/17  2020-112773  2020/07/27  Published 
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Awards
CSS2020奨励賞  より少ない漏洩の下で安全な動的検索可能暗号への変換手法  2020 
CSS2019奨励賞  (強)フォワード安全な動的検索可能暗号の効率的な構成  2019 
CSS2018優秀論文賞  CBDH仮定に基づく効率的な閾値公開鍵暗号  2018 
IEEE Information Theory Society Japan Chapter Young Researcher Best Paper Award  Card-Based Majority Voting Protocols with Three Inputs Using Three Cards  2018 
SCIS論文賞  暗号文の耐改変性と復号権限の変更機能をもつ情報理論的に安全な放送型暗号  2016 
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Grants-in-aid for scientific research
広範な検索機能と高い効率性を両立する秘匿検索技術の実現  "Scientific research (B), general"  2021/04-2025/03 
十分統計量に基づくシミュレーションベース安全性の深化  "Scientific research (B), general"  2021/04-2025/03 
Resilience Enhancement of IoT Ecosystem by Cryptographic Technologies  Scientific research (S)  2020/04-2023/03 
Searchable Symmetric Encryption for a Long Term Use  "Scientific research (C), general"  2020/04-2022/03 
推測秘匿性に基づく情報理論的暗号理論の新展開  "Scientific research (B), general"  2017/04-2021/03 
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External fund
科学技術人材育成費補助金(卓越研究員事業)  Other grants  文部科学省  2019/12-2021/03 
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Past records of joint or funded research
高機能暗号の鍵運用技術  2021-Present  Joint research  Domestic joint research 
ハイブリッド秘匿検索の高性能・高機能化  2020-2021  Joint research  Domestic joint research 
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Memberships of academic societies
International Association for Cryptographic Research (IACR)  2016/02-Present 
電子情報通信学会  2014/03-Present 
情報処理学会  2013/04-Present 
IEEE  2013/03-Present 
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Involvement in conference and research meetings
PKC 2022  General Co-Chairs  2022/03 
ITW 2021  Program Committee  2021 
IWSEC 2021  Local Organizing Committee  2021 
IWSEC 2021  Program Committee  2021 
APKC 2021  Program Committee  2021 
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Media coverage
Other  Newton Press  Newton 別冊 数学の世界 現代編 (増補第2版) 「暗号 個人情報を守る数学 (pp.98-115)」  2021/03/16 
Newspaper  日本経済新聞  暗号化したデータクラウドで利用容易  2019/08/05 
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Social activities
Other social contributions  予算申請書作成メンタリング -日本学術振興会特別研究員 DC1・DC2 の申請者の支援サービス-  2021/04-2021/04  情報処理学会のジュニア会員・若手研究者への支援の一環として、日本学術振興会特別研究員 DC1・DC2 の申請者の支援サービスが企画され、希望者の申請書の簡易的な添削を行った。 
Academic journal activities  2020年 電子情報通信学会英文論文誌 情報理論とその応用小特集号編集委員  2019/05-2020/12 
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