About us

We are Cryptology & Algorithm Lab and our leader is Professor Jae Hong Seo. Our main research interests are in cryptography especially zero-knowledge proof. Besides cryptography, we’re interested in artificial intelligence using deep learning such as face recognition and speaker recognition.

Annual News

  • (Oct 23, 2025) The following paper has been accepted for presentation at NDSS 2026.
    • Nirajan Koirala, Seunghun Paik, Sam Martin, Helena Berens, Tasha Januszewicz, Jonathan Takeshita, Jae Hong Seo, Taeho Jung
      Select-Then-Compute: Encrypted Label Selection and Analytics over Distributed Datasets using FHE
  • (Oct 15, 2025) Sunpill Kim and Chanwoo Hwang, members of our lab, will be giving a talk at the Hanyang University Mathematics Colloquium on the following topics.
    • Date & Place : 04:00 PM, Oct 16 / Natural Science Building 206
    • Topic 1 : Non-Adaptive Adversarial Face Generation
    • Topic 2 : Scores Know Bob’s Voice: Non-Adaptive Speaker Impersonation Attack
  • (Sep 23, 2025) Papers led by C&A members won several awards at the National Cryptographic Technology Contest, 2025.
    • The following paper won the Excellence Award. Congrats all authors who participated in this submission.
      • Seunghun Paik, Nirajan Koirala, Jack Nero, Hyunjung Son, Yunki Kim, Jae Hong Seo, and Taeho Jung
        Scalable Private Membership Test over Distributed and Encrypted Data
    • The following 2 papers won the Special Award. Congrats all authors who participated in these submissions.
      • Sunpill Kim, Seunghun Paik, Chanwoo Hwang, Minsu Kim, and Jae Hong Seo
        Non-Adaptive Adversarial Face Generation
      • Chanwoo Hwang, Sunpill Kim, Yong Kiam Tan, Tianchi Liu, Seunghun Paik, Dongsoo Kim, Soumik Mondal, Khin Mi Mi Aung, and Jae Hong Seo
        Scores Know Bob’s Voice: Non-Adaptive Speaker Impersonation Attack
  • (Sep 19, 2025) The following paper has been accepted for presentation at NeurIPS 2025.
    • Sunpill Kim, Seunghun Paik, Chanwoo Hwang, Minsu Kim, and Jae Hong Seo
      Non-Adaptive Adversarial Face Generation
  • (Sep 07, 2025) The following 2 papers have been accepted for presentation at IEEE ICTC 2025.
    • Changjin Kim, Chanwoo Hwang, Sunpill Kim, and Jae Hong Seo
      A Survey of Model Inversion Attacks on Image Domain
    • Yunki Kim, Hyunjung Son, Seunghun Paik, and Jae Hong Seo
      A Survey on Fuzzy Private Set Intersection Protocols
  • (Aug 28, 2025) The following 2 projects supported by the National Research Foundation of Korea (NRF) have started.
    • Design Identity-Preserving Inverse Models: Exploring Vulnerabilities in Speaker Recognition Systems
    • A Study of Fuzzy Private Set Intersection
  • (Aug 4, 2025) Seunghun Paik has been invited to give a poster presentation at the KCCV 2025.
    • Date & Place : 02:30 PM, Aug 6 / BEXCO, Busan, Korea
    • Seunghun Paik, Dongsoo Kim, Chanwoo Hwang, Sunpill Kim, and Jae Hong Seo
      Towards Certifiably Robust Face Recognition
  • (Jul 23, 2025) Yunki Kim visited the University of Notre Dame to do research on private set intersection protocols and their applications for six months. We wish success in his journey to become a good researcher!
  • (Jul 19, 2025) Hyunjung Son visited the University of Notre Dame to do research on the security technologies to protect data copyright for a month. We wish success in her journey to become a good researcher!
  • (Jun 26, 2025) The following paper has been accepted for presentation at ICCV 2025.
    • Sunpill Kim, Seunghun Paik, Chanwoo Hwang, Dongsoo Kim, Junbum Shin, and Jae Hong Seo
      IDFace: Face Template Protection for Efficient and Secure Identification
  • (Jun 22, 2025) The following paper has been accepted for presentation at ESORICS 2025.
    • Jaehwan Park, Hyeonbum Lee, Junbeom Hur, Jae Hong Seo, and Doowon Kim
      UTRA: Universal Token Reusability Attack and Token Unforgeable Delegatable Order-Revealing Encryption
  • (Jun 5, 2025) Doctor Mahdi Sedaghat from COSIC, KU Leuven, and founder of Soundness Labs will visit the C&A lab. He will give a lecture and discuss joint research.
    • Date & Place : 01:00 PM, May 20 / Natural Science Building 701
    • Title : Translating Zero-Knowledge Research into Real-World Web3 Solutions: zkLogin and More
      • (For the lecture abstract, click the arrow.) Abstract: In this talk, I will share some of my recent works on bringing zk to real-world usecases. As the main part of the talk, I will discuss how zkLogin has simplified users' onboarding process by using identity tokens from platforms like Google or Facebook to authenticate transactions. Instead of managing new secrets, users can sign in with their existing accounts, and zero-knowledge proofs ensure that the link between a user’s off-chain and on-chain identity stays hidden. Since its launch on the Sui blockchain, zkLogin has processed over 7 million zkLogin-signed transactions, containing around 2.5 million unique Zero-Knowledge Proofs (as of March 17, 2025), making it one of the most widely used zkApp. Additionally I will cover some extra use-cases like targeted Airdrops.
  • (Apr 8, 2025) Dongsoo Kim, a member of our lab, will be giving a talk at the Hanyang University Mathematics Colloquium on the following topic.
    • Date & Place : 04:00 PM, Apr 8 / Natural Science Building B119
    • Title : Certifiable robustness: Theoretically guaranted defence method against adversarial attacks on deep learning models
  • (Feb 27, 2025) The following project supported by the Korea Institute of Information Security & Cryptology (KIISC) has started.
    • Adversarial Attacks and Security Analysis on Commercial Face Recognition APIs
  • (Feb 10, 2025) Ph.D. Heewon Chung, a former postdoctoral researcher from our lab, has been appointed as an Assistant Professor in the Department of Software Engineering at Jeonbuk National University (전북대학교 소프트웨어공학과) in South Korea.
  • (Jan 1, 2025) The following paper has been accepted for publication at Pattern Recognition.
    • Sunpill Kim, Hoyong Shin, and Jae Hong Seo
      Deep Face Template Protection in the Wild

We share information with each other through various seminars/studies that support research capabilities every summer/winter vacation to enhance research and inquiry skills. Each season, the main topic changes and the schedule also changes accordingly. External personnel are also free to participate, and you can attend by filling out the form from above link.

2025 Fall Seminar

Date Place Title Presenter Material
10/28 Natural Building 702 Fuzzy Private Set Intersection from VOLE Yunki Kim Link
11/4 Natural Building 702 Non-Interactive Multiplication and More Seunghun Paik Link

Contact

For any inquires, you can reach us via email: jaehongseo@hanyang.ac.kr