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Affiliation |
Institute of Advanced Sciences |
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Job Title |
Specially Appointed Assistant Professor |
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Research Fields, Keywords |
graph theory, elliptic curve-based cryptography, post-quantum cryptography |
JO Hyungrok
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The Best Research Achievement in Research Career 【 display / non-display 】
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【Published Thesis】 Ramanujan graphs for post-quantum cryptography 2020.10
【Published Thesis】 Full cryptanalysis of hash functions based on cubic Ramanujan graphs 2017.09
【Published Thesis】 Cryptographic hash functions based on Triplet and Sextet graphs 2022.01
The Best Research Achievement in the last 5 years 【 display / non-display 】
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【Published Thesis】 Generalized LPS Ramanujan graphs 2022.08
【Published Thesis】 Ramanujan graphs for post-quantum cryptography 2020.10
【Published Thesis】 Cryptographic hash functions based on Triplet and Sextet graphs 2022.01
【Published Thesis】 Cayley hash function-map based on LPS-type Ramanujan graphs 2019.10
Education 【 display / non-display 】
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2014.10-2017.3
Kyushu University Doctor Course Graduated
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2014.3-2014.9
釜山大学校 大学院数学科博士後期課程 数理学専攻 Doctor Course Unfinished Course
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2011.3-2013.8
釜山大学校 大学院数学科修士課程 数理学専攻 Master Course Graduated
Degree 【 display / non-display 】
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Master of Mathematics - Kyushu University
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Master of Science (Mathematics) - Pusan National University
Campus Career 【 display / non-display 】
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2021.10
Duty Yokohama National UniversityInstitute of Advanced Sciences Specially Appointed Assistant Professor
External Career 【 display / non-display 】
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2021.4-2022.3
Lecturer
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2019.5-2021.9
Researcher
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2018.4-2019.4
Researcher
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2017.4-2018.3
Researcher
Academic Society Affiliations 【 display / non-display 】
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2022.2
日本応用数理学会 (JSIAM)
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2019.4
電子情報通信学会 (IEICE)
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2017.4
大韓数学会 (KMS)
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2014.10
国際暗号学会 (IACR)
Research Areas 【 display / non-display 】
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Informatics / Information security
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Natural Science / Basic mathematics
Thesis for a degree 【 display / non-display 】
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Cryptanalysis on hash functions based on Ramanujan graphs
Hyungrok JO
2017.3
Doctoral Thesis Single Work [Reviewed]
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On p-semisimplicity of Cayley graphs
Hyungrok JO
2013.8
Master Thesis Single Work
Papers 【 display / non-display 】
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Ramanujan graphs for post-quantum cryptography
Hyungrok JO, Shingo SUGIYAMA, Yoshinori YAMASAKI
International Symposium on Mathematics, Quantum Theory, and Cryptography, Proceedings of MQC2019, Mathematics for Industry 2020.10 [Reviewed]
Language：English Publishing type：Research paper (international conference proceedings) Single Work
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Full cryptanalysis of hash functions based on cubic Ramanujan graphs
Hyungrok JO, Christophe PETIT, Tsuyoshi TAKAGI
IEICE Transaction on Fundamentals of Electronics, Communications and Computer Sciences 2017.9 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Single Work
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Hash functions based on Ramanujan graphs
Hyungrok JO
Special Issue on Mathematical Modelling for Next-Generation Cryptography, Mathematics for Industry 2017.7 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Single Work
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Generalized LPS Ramanujan graphs
Hyungrok JO
RIMS Kôkyûroku Bessatsu B90 2022.8 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Single Work
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Generalized LPS Ramanujan graphs (Theory and Applications of Supersingular Curves and Supersingular Abelian Varieties)
JO Hyungrok
数理解析研究所講究録別冊 B90 153 - 167 2022.6
Language：English Publishing type：Research paper (scientific journal) Publisher：Research Institute for Mathematical Sciences, Kyoto University Single Work
We show how to construct generalized LPS Ramanujan graphs (LPS-type graphs), and prove their Ramanujan-ness on the limited case. This work is originally based on “Ramanujan graphs for post-quantum cryptography” in the proceedings of MQC 2019.
Awards 【 display / non-display 】
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学術優秀賞
2021.3 在日韓国科学技術者協会
Individual or group name of awards：Hyungrok JO
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Excellent Poster Award
2015.10 九州大学IMI
Individual or group name of awards：Hyungrok JO
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Excellent Presentation Award
2013.6 大阪市立大学OCAMI
Individual or group name of awards：Hyungrok JO
Other external funds procured 【 display / non-display 】
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エクスパンダーグラフの新しい構成手法の確立とその応用
2022.8
Authorship：Coinvestigator(s)
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ラマヌジャン・グラフの整数論による耐量子計算機暗号へのアプローチ
2021.8 - 2021.9
Authorship：Principal investigator
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トロピカル楕円曲線論における計算困難問題の探究と暗号技術への応用
2021.3
Authorship：Principal investigator
Presentations 【 display / non-display 】
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On cryptographic hash functions based on cubic high-girth graph
Hyungrok JO, Shohei SATAKE
日本応用数理学会 第18回 研究部会連合発表会 離散システム研究部会
Event date： 2022.3
Language：Japanese Presentation type：Oral presentation (general)
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Implementations on identity-based signature schemes based on variants of CSIDH
Hyungrok JO, Junji SHIKATA
2022年暗号と情報セキュリティシンポジウム (SCIS2022)
Event date： 2022.1
Language：Japanese Presentation type：Oral presentation (general)
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ラマヌジャングラフの研究とその暗号応用
Hyungrok JO
CREST「現代の数理科学と連携するモデリング手法の構築」 成果報告公開シンポジウム
Event date： 2021.9
Language：Japanese Presentation type：Poster presentation
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ラマヌジャングラフの研究とその暗号応用
Hyungrok JO
CREST「現代の数理科学と連携するモデリング手法の構築」 成果報告公開シンポジウム,
Event date： 2021.9
Language：Japanese Presentation type：Oral presentation (general)
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On Ramanujan graphs in the era of Post-Quantum Cryptography
Hyungrok JO [Invited]
組合せ論・モデル理論セミナー
Event date： 2021.7
Language：Japanese Presentation type：Oral presentation (invited, special)
Charge of off-campus class subject 【 display / non-display 】
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データサイエンス
2021.9 - 2022.3 Institution：筑波大学
Level：Undergraduate (liberal arts)
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情報リテラシー演習
2021.4 - 2022.8 Institution：筑波大学
Level：Undergraduate (liberal arts)