publications

2024

1. NSS:MCHS24

   How to Accomplish Key and Communication Compression Over Authentication Channels: Proxy Re-Authentication and its instantiations (To Appear)

   Yoshiro Matsuoka, Sohto Chiku, Keisuke Hara, and Junji Shikata

   In 18th International Conference on Network and System Security (NSS 2024), Nov 2024

   Bib

   @inproceedings{NSS:MCHS24,
     author = {Matsuoka, Yoshiro and Chiku, Sohto and Hara, Keisuke and Shikata, Junji},
     title = {How to Accomplish Key and Communication Compression Over Authentication Channels: Proxy Re-Authentication and its instantiations (To Appear)},
     booktitle = {18th International Conference on Network and System Security (NSS 2024)},
     series = {Lecture Notes in Computer Science},
     volume = {xxx},
     pages = {xxx-xxx},
     publisher = {Springer},
     year = {2024},
     month = nov
   }

2. CSS:CHHTS24

   CCA安全な登録ベース暗号

   知久奏斗,  橋本啓太郎,  原啓祐,  冨田斗威, and  四方順司

   In コンピュータセキュリティシンポジウム2024(CSS 2024), Oct 2024

   Bib

   @inproceedings{CSS:CHHTS24,
     author = {知久奏斗 and 橋本啓太郎 and 原啓祐 and 冨田斗威 and 四方順司},
     title = {CCA安全な登録ベース暗号},
     booktitle = {コンピュータセキュリティシンポジウム2024(CSS 2024)},
     year = {2024},
     month = oct,
     pages = {1H4-2}
   }

3. ePrint:CHS24

   Chosen Ciphertext Security for (Hierarchical) Identity-Based Matchmaking Encryption

   Sohto Chiku, Keisuke Hara, and Junji Shikata

   In Cryptology ePrint Archive, Aug 2024

   Bib PDF

   @inproceedings{ePrint:CHS24,
     author = {Chiku, Sohto and Hara, Keisuke and Shikata, Junji},
     title = {Chosen Ciphertext Security for (Hierarchical) Identity-Based Matchmaking Encryption},
     booktitle = {Cryptology ePrint Archive},
     howpublished = {Cryptology ePrint Archive, Paper 2024/1292},
     year = {2024},
     month = aug,
     note = {\url{https://eprint.iacr.org/2024/1292}},
     url = {https://eprint.iacr.org/2024/1292}
   }

4. CANS:CHHTS24

   How to Apply Fujisaki-Okamoto Transformation to Registration-Based Encryption

   Sohto Chiku, Keisuke Hara, Keitaro Hashimoto, Toi Tomita, and Junji Shikata

   In The 23rd International Conference on Cryptology And Network Security (CANS 2024), Oct 2024

   Bib

   @inproceedings{CANS:CHH+24,
     author = {Chiku, Sohto and Hara, Keisuke and Hashimoto, Keitaro and Tomita, Toi and Shikata, Junji},
     title = {How to Apply Fujisaki-Okamoto Transformation to Registration-Based Encryption},
     booktitle = {The 23rd International Conference on Cryptology And Network Security (CANS 2024)},
     series = {Lecture Notes in Computer Science},
     volume = {14906},
     pages = {145-165},
     publisher = {Springer},
     year = {2024},
     month = oct,
     url = {https://doi.org/10.1007/978-981-97-8016-7_7}
   }

5. ISEC:MCHS24

   鍵圧縮及びデータ圧縮を可能にするプロキシ再認証方式

   松岡耀志郎,  知久奏斗,  原啓祐, and  四方順司

   In 信学技報, Mar 2024

   Bib

   @inproceedings{ISEC2403:MCHS24,
     author = {松岡耀志郎 and 知久奏斗 and 原啓祐 and 四方順司},
     title = {鍵圧縮及びデータ圧縮を可能にするプロキシ再認証方式},
     booktitle = {信学技報},
     publisher = {電子情報通信学会},
     volume = {123},
     number = {424},
     year = {2024},
     month = mar,
     pages = {52-59}
   }

6. SCIS:CHHS24

   BDH仮定に基づく高効率かつ強安全なIDベースマッチメイキング暗号

   知久奏斗,  橋本啓太郎,  原啓祐, and  四方順司

   In 2024年暗号と情報セキュリティシンポジウム(SCIS 2024), Jan 2024

   Bib

   @inproceedings{SCIS:CHHS24,
     author = {知久奏斗 and 橋本啓太郎 and 原啓祐 and 四方順司},
     title = {BDH仮定に基づく高効率かつ強安全なIDベースマッチメイキング暗号},
     booktitle = {2024年暗号と情報セキュリティシンポジウム(SCIS 2024)},
     year = {2024},
     month = jan,
     pages = {3C1-3}
   }

2023

1. ePrint:CHHS23

   Identity-Based Matchmaking Encryption, Revisited: Strong Security and Practical Constructions from Standard Classical and Post-Quantum Assumptions

   Sohto Chiku, Keitaro Hashimoto, Keisuke Hara, and Junji Shikata

   In Cryptology ePrint Archive, Sep 2023

   Bib PDF

   @inproceedings{ePrint:CHHS23,
     author = {Chiku, Sohto and Hashimoto, Keitaro and Hara, Keisuke and Shikata, Junji},
     title = {Identity-Based Matchmaking Encryption, Revisited: Strong Security and Practical Constructions from Standard Classical and Post-Quantum Assumptions},
     booktitle = {Cryptology ePrint Archive},
     howpublished = {Cryptology ePrint Archive, Paper 2023/1435},
     year = {2023},
     month = sep,
     note = {\url{https://eprint.iacr.org/2023/1435}},
     url = {https://eprint.iacr.org/2023/1435}
   }

2. ISPEC:CHS23

   Chosen Ciphertext Security for Blind Identity-based Encryption with Certified Identities

   Sohto Chiku, Keisuke Hara, and Junji Shikata

   In The 18th International Conference on Information Security Practice and Experience (ISPEC 2023), Nov 2023

   Bib

   @inproceedings{ISPEC:CHS23,
     author = {Chiku, Sohto and Hara, Keisuke and Shikata, Junji},
     title = {Chosen Ciphertext Security for Blind Identity-based Encryption with Certified Identities},
     booktitle = {The 18th International Conference on Information Security Practice and Experience (ISPEC 2023)},
     series = {Lecture Notes in Computer Science},
     volume = {14341},
     pages = {299-314},
     publisher = {Springer},
     year = {2023},
     month = nov
   }

3. ProvSec:CHS23

   Identity-based Matchmaking Encryption Secure against Key Generation Center

   Sohto Chiku, Keisuke Hara, and Junji Shikata

   In The 17th International Conference on Provable and Practical Security (ProvSec 2023), Oct 2023

   Bib

   @inproceedings{ProvSec:CHS23,
     author = {Chiku, Sohto and Hara, Keisuke and Shikata, Junji},
     title = {Identity-based Matchmaking Encryption Secure against Key Generation Center},
     booktitle = {The 17th International Conference on Provable and Practical Security (ProvSec 2023)},
     series = {Lecture Notes in Computer Science},
     volume = {14217},
     pages = {251–273},
     publisher = {Springer},
     year = {2023},
     month = oct
   }

4. ISEC:CHS23b

   階層型IDベースマッチメイキング暗号

   知久奏斗,  原啓祐, and  四方順司

   In 信学技報, Jul 2023

   Bib

   @inproceedings{ISEC:CHS23b,
     author = {知久奏斗 and 原啓祐 and 四方順司},
     title = {階層型IDベースマッチメイキング暗号},
     booktitle = {信学技報},
     publisher = {信学技報},
     volume = {123},
     number = {129},
     year = {2023},
     month = jul,
     pages = {60-67}
   }

5. ISEC:CHS23a

   鍵生成センタに対して安全なIDベースマッチメイキング暗号

   知久奏斗,  原啓祐, and  四方順司

   In 信学技報, Mar 2023

   Bib

   @inproceedings{ISEC:CHS23a,
     author = {知久奏斗 and 原啓祐 and 四方順司},
     title = {鍵生成センタに対して安全なIDベースマッチメイキング暗号},
     booktitle = {信学技報},
     publisher = {信学技報},
     volume = {122},
     number = {428},
     year = {2023},
     month = mar,
     pages = {179-186}
   }

2020

1. Robomech:CF20

   CAM System for On-Machine Polishing Based on Five-Axis Control: Application Results for Convex and Concave Surface (In Japanese)

   Sohto Chiku, and Mikio Fujio

   The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec), Mar 2020

   Bib

   @article{Robomech:CF20,
     author = {Chiku, Sohto and Fujio, Mikio},
     title = {CAM System for On-Machine Polishing Based on Five-Axis Control: Application Results for Convex and Concave Surface (In Japanese)},
     journal = {The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec)},
     issn = {2424-3124},
     publisher = {The Japan Society of Mechanical Engineers},
     year = {2020},
     volume = {2020},
     number = {0},
     pages = {2P2-B13},
     doi = {10.1299/jsmermd.2020.2p2-b13},
     url = {https://cir.nii.ac.jp/crid/1390004951545384064}
   }