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

Seminar May 29, 2026

Prof. Taeho Jung from the University of Notre Dame will visit the C&A Lab for an academic exchange and research collaboration.

Date & Place: 01:00 PM, May 29 / Natural Science Building 702

Seminar 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

Member May 4, 2026

Two undergraduate students Hyeonmin Jang and Ingeun Yun joined our Cryptology & Algorithm Lab. We are delighted to welcome them.

Seminar 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

Journal Apr 13, 2026

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

Conference Apr 10, 2026

Accepted for publication at ACM CCS 2026.

Seunghun Paik†, Sunpill Kim†, Chanwoo Hwang, and Jae Hong Seo*
Casting the Net! Revisiting MasterFace Impersonation Attacks

Program Apr 9, 2026

Yunki Kim has been selected for the National Cryptographic Expert Training Program (NACET) 12th cohort.

Award Apr 3, 2026

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

Workshop Mar 18, 2026

C&A Lab hosted the “MATH: Make AI Trust Higher” workshop at Hanyang University. View poster

Award 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

Journal Jan 13, 2026

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

Member Jan 5, 2026

Insoo Kim (undergraduate student) joined Cryptology & Algorithm Lab, and we are pleased to welcome him to our Lab.

Seminar

Interested in joining the lab? ↗

2026 · Spring / Summer Seminar

4 sessions

Apr 24 · 10:00–12:00 Slides ↗

Deep Neural Cryptography
Seunghun Paik · Natural Building 702

May 8 · 10:00–12:00 Slides ↗

Towards Deep Conversational Recommendations
Changjin Kim · Natural Building 702

May 15 · 10:00–12:00 Slides ↗

Denoising Diffusion Implicit Models
Minsu Kim · Natural Building 702

May 22 · 10:00–12:00 Slides ↗

Concept-based Adversarial Attack: a Probabilistic Perspective
Chanwoo Hwang · Natural Building 702

2026 · Spring · Probabilistic ML Study Group

12 sessions

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

May 7 · 17:30–19:30 Slides ↗

Linear Algebra — I (prerequisite)
Minsu Kim · Natural Building 742

May 14 · 17:30–19:30 Slides ↗

Linear Algebra — II (prerequisite)
Minsu Kim · Natural Building 742

May 21 · 17:30–19:30 TBA

Ch 2 & 3 · Probability: Univariate & Multivariate Models
Ingeun Yun · Natural Building 702

May 28 · 17:30–19:30 TBA

Ch 4 & 6 · Statistics & Information Theory
Insoo Kim · Place TBA

Jun 4 · 17:30–19:30 TBA

Ch 9 & 10 · Linear Discriminant Analysis & Logistic Regression
Hyeonmin Jang · Place TBA

Jun 11 · 17:30–19:30 TBA

Ch 11 · Linear Regression
Shinwoong Kwak · Place TBA

Jun 18 · 17:30–19:30 TBA

Ch 13 · Neural Networks for Tabular Data
Ingeun Yun · Place TBA

Jun 25 · 17:30–19:30 TBA

Ch 14 · Neural Networks for Images
Insoo Kim · Place TBA

Jul 2 · 17:30–19:30 TBA

Ch 15 · Neural Networks for Sequences
Hyeonmin Jang · Place TBA

Jul 9 · 17:30–19:30 TBA

Ch 17 · Kernel Methods
Minsu Kim · Place TBA

Jul 16 · 17:30–19:30 TBA

Ch 19 · Learning with Fewer Labeled Examples
Shinwoong Kwak · Place TBA

Jul 23 · 17:30–19:30 TBA

Ch 20 & 21 · Dimensionality Reduction & Clustering
Minsu Kim · Place TBA

2025 Fall · 2026 Winter Seminar

9 sessions

Oct 28 · 13:00–15:00 Slides ↗

Fuzzy Private Set Intersection from VOLE
Yunki Kim · Natural Building 702

Nov 4 · 13:00–15:00 Slides ↗

Non-Interactive Multiplication and More
Seunghun Paik · Natural Building 702

Nov 11 · 13:00–15:00 Slides ↗

ICCV 2025 (Conference Review)
Changjin Kim · Natural Building 702

Dec 23 · 15:00–17:00 Slides ↗

NeurIPS 2025 (Conference Review)
Minsu Kim · Natural Building 702

Dec 30 · 15:00–17:00 Slides ↗

Introduction to Text-to-Image Models
Chanwoo Hwang · Natural Building 746

Jan 20 · 15:00–17:00 Slides ↗

Implicit Bias of SGD in L2-regularized Linear DNNs: One-way Jumps from High to Low Rank
Dongsoo Kim · Natural Building B119

Jan 27 · 13:00–15:00 Slides ↗

Mamba: Linear-Time Sequence Modeling with Selective State Spaces
Hyunjung Son · Natural Building 702

Feb 3 · 13:00–15:00 Slides ↗

Back to Basics: Let Denoising Generative Models Denoise
Insoo Kim · Natural Building 702

Feb 10 · 13:00–15:00 Slides ↗

Subspace Collision: An Efficient & Accurate Framework for High-dimensional Approximate Nearest Neighbor Search
Yunki Kim · Natural Building 701

2026 Winter · Special Topic: Vision Language Models

6 sessions

Jan 9 · 15:00–17:00 Slides ↗

Introduction to (Large) Language Models
Seunghun Paik · Natural Building 702

Jan 16 · 15:00–17:00 Slides ↗

Learning Transferable Visual Models from Natural Language Supervision (CLIP)
Changjin Kim · Natural Building B119

Jan 23 · 15:00–17:00 Slides ↗

CLIP Variants
Minsu Kim · Natural Building B119

Jan 30 · 15:00–17:00 Slides ↗

Mind the Gap: About Modality Gap
Chanwoo Hwang · Natural Building 702

Feb 13 · 15:00–17:00 Slides ↗

Attack Methods for CLIP and Vision–Language Pre-trained Models
Dongsoo Kim · Natural Building 702

Feb 20 · 15:00–17:00 Slides ↗

BLIP, BLIP2, and Flamingo
Seunghun Paik · Natural Building 702

Contact

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