About the Lab

We are a cryptography research group in the Department of Convergence Security Engineering at Sungshin Women’s University. Our research lies at the intersection of applied cryptography and cryptanalysis, with two main themes:

  • Cryptography for Collaborative Analysis. We design cryptographic protocols that let multiple parties jointly analyze their data without revealing it to each other. This includes homomorphic encryption, secure multi-party computation, and their applications such as private set intersection (PSI), private record linkage, and privacy-preserving machine learning / genomic analysis.

  • Analysis of Cryptographic Assumptions. We study the concrete security of the hardness assumptions that modern (post-quantum) cryptography is built on, most notably lattice problems such as LWE with small or sparse secrets. Understanding how hard these problems really are is essential for choosing safe and efficient parameters.

πŸ“’ We are recruiting!

We are always looking for motivated students who want to work on cryptography and privacy-enhancing technologies: graduate students (M.S. / Ph.D.) and undergraduate interns. A background in mathematics, computer science, or security is welcome, and no prior experience in cryptography is required.

If you are interested, please send an e-mail to yongha DOT son AT sungshin.ac.kr with a short introduction. See the People page for the current members.

연ꡬ싀 μ†Œκ°œ

μ„±μ‹ μ—¬μžλŒ€ν•™κ΅ μœ΅ν•©λ³΄μ•ˆκ³΅ν•™κ³Όμ˜ μ•”ν˜Έν•™ μ—°κ΅¬μ‹€μž…λ‹ˆλ‹€. μ‘μš© μ•”ν˜Έμ™€ μ•”ν˜Έ λΆ„μ„μ˜ μ ‘μ μ—μ„œ, 크게 두 가지 주제λ₯Ό μ—°κ΅¬ν•©λ‹ˆλ‹€.

  • ν˜‘λ ₯적 데이터 뢄석을 μœ„ν•œ μ•”ν˜Έ 기술. μ—¬λŸ¬ 기관이 μ„œλ‘œμ˜ 데이터λ₯Ό κ³΅κ°œν•˜μ§€ μ•Šκ³ λ„ ν•¨κ»˜ 뢄석할 수 있게 ν•˜λŠ” μ•”ν˜Έ ν”„λ‘œν† μ½œμ„ μ„€κ³„ν•©λ‹ˆλ‹€. λ™ν˜•μ•”ν˜Έ, μ•ˆμ „ν•œ λ‹€μžκ°„ 계산(MPC) κ³Ό 이λ₯Ό μ‘μš©ν•œ ν”„λΌμ΄λ²„μ‹œ 보쑴 ꡐ집합 μ—°μ‚°(PSI), μ•ˆμ „ν•œ λ ˆμ½”λ“œ κ²°ν•©, ν”„λΌμ΄λ²„μ‹œ 보쑴 κΈ°κ³„ν•™μŠ΅ 및 μœ μ „μ²΄ 뢄석 등이 여기에 ν¬ν•¨λ©λ‹ˆλ‹€.

  • μ•”ν˜Έν•™μ  κ°€μ •μ˜ 뢄석. ν˜„λŒ€ (μ–‘μžλ‚΄μ„±) μ•”ν˜Έκ°€ 기반으둜 μ‚ΌλŠ” μ–΄λ €μš΄ λ¬Έμ œλ“€, 특히 μž‘μ€ λΉ„λ°€ν‚€λ‚˜ ν¬μ†Œ λΉ„λ°€ν‚€λ₯Ό κ°–λŠ” LWE와 같은 격자 문제 의 ꡬ체적인 μ•ˆμ „μ„±μ„ λΆ„μ„ν•©λ‹ˆλ‹€. 이 λ¬Έμ œλ“€μ΄ μ‹€μ œλ‘œ μ–Όλ§ˆλ‚˜ μ–΄λ €μš΄μ§€λ₯Ό μ΄ν•΄ν•˜λŠ” 것은 μ•ˆμ „ν•˜λ©΄μ„œλ„ 효율적인 νŒŒλΌλ―Έν„°λ₯Ό κ³ λ₯΄λŠ” 데 ν•„μˆ˜μ μž…λ‹ˆλ‹€.

πŸ“’ 연ꡬ싀 학생을 λͺ¨μ§‘ν•©λ‹ˆλ‹€!

μ•”ν˜Έν•™κ³Ό ν”„λΌμ΄λ²„μ‹œ κ°•ν™” κΈ°μˆ μ— 관심 μžˆλŠ” λŒ€ν•™μ›μƒ(석사 / 박사)κ³Ό ν•™λΆ€ 인턴을 μƒμ‹œ λͺ¨μ§‘ν•©λ‹ˆλ‹€. μˆ˜ν•™, 컴퓨터과학, λ³΄μ•ˆ κ΄€λ ¨ 배경이면 ν™˜μ˜ν•˜λ©°, μ•”ν˜Έν•™μ„ 미리 κ³΅λΆ€ν–ˆμ„ ν•„μš”λŠ” μ—†μŠ΅λ‹ˆλ‹€.

관심 μžˆλŠ” 뢄은 κ°„λ‹¨ν•œ μžκΈ°μ†Œκ°œμ™€ ν•¨κ»˜ yongha DOT son AT sungshin.ac.kr 둜 메일 μ£Όμ„Έμš”. ν˜„μž¬ ꡬ성원은 People νŽ˜μ΄μ§€μ—μ„œ λ³Ό 수 μžˆμŠ΅λ‹ˆλ‹€.

newsμ†Œμ‹

Jul 20262026λ…„ 7μ›” Our paper A Private-Identifier System from Scalable Private Set Union (with Sangmin Lee and Jiseung Kim) has been published in IET Information Security.A Private-Identifier System from Scalable Private Set Union (이상민, κΉ€μ§€μŠΉ 곡저) 논문이 IET Information Security에 κ²Œμž¬λ˜μ—ˆμŠ΅λ‹ˆλ‹€.
Mar 20262026λ…„ 3μ›” Our project Cryptographic Identifier Matching and Data Aggregation Protocols for Collaborative Data Analysis has been selected for funding by the National Research Foundation of Korea (NRF).μ—°κ΅¬κ³Όμ œ μ•ˆμ „ν•œ 데이터 뢄석을 μœ„ν•œ μ‹λ³„μž 기반 맀칭 및 데이터 κ²°ν•© μ›μ²œ 기술 개발이 ν•œκ΅­μ—°κ΅¬μž¬λ‹¨(NRF) 과제둜 μ„ μ •λ˜μ—ˆμŠ΅λ‹ˆλ‹€.
Jan 20262026λ…„ 1μ›” Our paper Private Set Operations from Circuit-Based PSI (with Jiseung Kim and Hyung Tae Lee) has been accepted to ACM SAC 2026.Private Set Operations from Circuit-Based PSI (κΉ€μ§€μŠΉ, μ΄ν˜•νƒœ 곡저) 논문이 ACM SAC 2026에 μ±„νƒλ˜μ—ˆμŠ΅λ‹ˆλ‹€.