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

  • (May 20, 2026) Prof. Yongha Son from Sungshin Women’s University will visit the C&A Lab and give a lecture.
    • Date & Place: 01:30 PM, May 21 / Natural Science Building 102
    • Title: Private Set Intersection
  • (May 4, 2026) Two undergraduate students Hyeonmin Jang and Ingeun Yun joined our Cryptology & Algorithm Lab. We are delighted to welcome them.
  • (Apr 20, 2026) Dr. Keewoo Lee from the Ethereum Foundation visited the C&A Lab and gave a lecture.
    • Date & Place: 01:00 PM, Apr 20 / Natural Science Building 702
    • Title: Private Information Retrieval
  • (Apr 13, 2026) The following paper has been accepted for publication at IEEE Access.
    • Minsu Kim†, Seunghun Paik†, Seongae Baek, Sangyoon Shin, Sunpill Kim, and Jae Hong Seo*
      SilverMask: Face Template Protection with Fine-Grained Noise Correction
  • (Apr 10, 2026) The following paper has been accepted for publication at ACM CCS 2026.
    • Seunghun Paik†, Sunpill Kim†, Chanwoo Hwang, and Jae Hong Seo*
      Casting the Net! Revisiting MasterFace Impersonation Attacks
  • (Apr 9, 2026) Yunki Kim has been selected for the National Cryptographic Expert Training Program (NACET) 12th cohort.
  • (Apr 3, 2026) The following paper has been selected Outstanding Paper at Hanyang University.
    • Seunghun Paik, Chanwoo Hwang, Sunpill Kim, and Jae Hong Seo*
      On the Reversibility of Locality-Sensitive Hashing-Based Biometric Template Protections
      IEEE Transactions on Dependable and Secure Computing
  • (Mar 18, 2026) C&A Lab hosted the “MATH: Make AI Trust Higher” workshop at Hanyang University.
    Poster: MATH Workshop
  • (Feb 5, 2026) Sunpill Kim will receive the Outstanding Ph.D. Dissertation Award from Hanyang University.
    • Sunpill Kim
      Score-Based Non-Adaptive Attack Against Face Recognition Systems
  • (Jan 13, 2026) The following paper has been accepted for publication at IEEE Access.
    • Hyeonbum Lee, Seunghun Paik, Hyunjung Son, and Jae Hong Seo*
      Cougar: Cubic Root Verifier Inner Product Argument under Discrete Logarithm Assumption
  • (Jan 5, 2026) Insoo Kim (undergraduate student) joined Cryptology & Algorithm Lab, and we are pleased to welcome him to our Lab.

Seminar

2026 · Spring / Summer

Spring / Summer Seminar

4 sessions
Apr 2410:00–12:00 KST
Deep Neural Cryptography
Natural Building 702
Seunghun Paik
Slides
May 810:00–12:00 KST
Towards Deep Conversational Recommendations
Natural Building 702
Changjin Kim
Slides
May 1510:00–12:00 KST
Denoising Diffusion Implicit Models
Natural Building 702
Minsu Kim
Slides
May 2210:00–12:00 KST
Concept-based Adversarial Attack: a Probabilistic Perspective
Natural Building 702
Chanwoo Hwang
Slides
2026 · Spring · Study Group

Probabilistic Machine Learning

12 sessions

Textbook: Probabilistic Machine Learning: An Introduction — Kevin P. Murphy  ·  reading the Introduction chapters in order, weekly.

May 717:30–19:30 KST
Linear Algebra — I (prerequisite)
Natural Building 742
Minsu Kim
Slides
May 1417:30–19:30 KST
Linear Algebra — II (prerequisite)
Natural Building 742
Minsu Kim
Slides
May 2117:30–19:30 KST
Ch 2 & 3 · Probability: Univariate & Multivariate Models
Natural Building 702
Ingeun Yun
TBA
May 2817:30–19:30 KST
Ch 4 & 6 · Statistics & Information Theory
Place TBA
Insoo Kim
TBA
Jun 417:30–19:30 KST
Ch 9 & 10 · Linear Discriminant Analysis & Logistic Regression
Place TBA
Hyeonmin Jang
TBA
Jun 1117:30–19:30 KST
Ch 11 · Linear Regression
Place TBA
Shinwoong Kwak
TBA
Jun 1817:30–19:30 KST
Ch 13 · Neural Networks for Tabular Data
Place TBA
Ingeun Yun
TBA
Jun 2517:30–19:30 KST
Ch 14 · Neural Networks for Images
Place TBA
Insoo Kim
TBA
Jul 217:30–19:30 KST
Ch 15 · Neural Networks for Sequences
Place TBA
Hyeonmin Jang
TBA
Jul 917:30–19:30 KST
Ch 17 · Kernel Methods
Place TBA
Minsu Kim
TBA
Jul 1617:30–19:30 KST
Ch 19 · Learning with Fewer Labeled Examples
Place TBA
Shinwoong Kwak
TBA
Jul 2317:30–19:30 KST
Ch 20 & 21 · Dimensionality Reduction & Clustering
Place TBA
Minsu Kim
TBA
2025 Fall · 2026 Winter

Fall / Winter Seminar

9 sessions
Oct 2813:00–15:00 KST
Fuzzy Private Set Intersection from VOLE
Natural Building 702
Yunki Kim
Slides
Nov 413:00–15:00 KST
Non-Interactive Multiplication and More
Natural Building 702
Seunghun Paik
Slides
Nov 1113:00–15:00 KST
ICCV 2025 (Conference Review)
Natural Building 702
Changjin Kim
Slides
Dec 2315:00–17:00 KST
NeurIPS 2025 (Conference Review)
Natural Building 702
Minsu Kim
Slides
Dec 3015:00–17:00 KST
Introduction to Text-to-Image Models
Natural Building 746
Chanwoo Hwang
Slides
Jan 2015:00–17:00 KST
Implicit Bias of SGD in L2-regularized Linear DNNs: One-way Jumps from High to Low Rank
Natural Building B119
Dongsoo Kim
Slides
Jan 2713:00–15:00 KST
Mamba: Linear-Time Sequence Modeling with Selective State Spaces
Natural Building 702
Hyunjung Son
Slides
Feb 313:00–15:00 KST
Back to Basics: Let Denoising Generative Models Denoise
Natural Building 702
Insoo Kim
Slides
Feb 1013:00–15:00 KST
Subspace Collision: An Efficient & Accurate Framework for High-dimensional Approximate Nearest Neighbor Search
Natural Building 701
Yunki Kim
Slides
2026 Winter · Special Topic

Vision Language Models (VLMs)

6 sessions
Jan 915:00–17:00 KST
Introduction to (Large) Language Models
Natural Building 702
Seunghun Paik
Slides
Jan 1615:00–17:00 KST
Learning Transferable Visual Models from Natural Language Supervision (CLIP)
Natural Building B119
Changjin Kim
Slides
Jan 2315:00–17:00 KST
CLIP Variants
Natural Building B119
Minsu Kim
Slides
Jan 3015:00–17:00 KST
Mind the Gap: About Modality Gap
Natural Building 702
Chanwoo Hwang
Slides
Feb 1315:00–17:00 KST
Attack Methods for CLIP and Vision–Language Pre-trained Models
Natural Building 702
Dongsoo Kim
Slides
Feb 2015:00–17:00 KST
BLIP, BLIP2, and Flamingo
Natural Building 702
Seunghun Paik
Slides

Contact

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