I'm an M.S. student at the Privacy and Applied Cryptography Lab (PAC Lab), DGIST, advised by Prof. Young-Sik Kim. My research focuses on post-quantum cryptography, from hardware implementation to side-channel analysis. I also work on post-quantum security in non-terrestrial networks and on machine learning, particularly diffusion models and differential privacy.
I enjoy taking photos. You can also find my travel blog, dev blog, and Notion blog.
News
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Excellence Award and Special Award at the 2026 National Cryptography Contest
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Grand Prize at the 4th KICS HFR Paper Award for OrbitCrypt
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"Codeword Masking Can Be Harmful Under Replay Attacks on HQC" accepted to ASIACRYPT 2026
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Passed the preliminary round of GRAVITY 2026, the joint startup program of KAIST, DGIST, GIST, and UNIST
Experience
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M.S. Student, DGIST
Electrical Engineering and Computer Science
Privacy and Applied Cryptography Lab (PAC Lab)
Samsung Electronics · Strategic Industry–Academia Project
High-performance hybrid PQC security IP and system architecture for the post-quantum transition
Role: Verilog HDL implementation and hardware–software co-optimization
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Research Intern, DGIST
Electrical Engineering and Computer Science
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B.S., Chungbuk National University
School of Computer Science
Publications
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Codeword Masking Can Be Harmful Under Replay Attacks on HQC [ePrint]
Jaeho Jeon, Yongseong Park, Jaeyeon Lee, Suseong Lee, Donghyen Kim, and Young-Sik Kim
Accepted
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OrbitCrypt: Anticipatory Multi-Target Session Resumption for Post-Quantum Handover in Non-Terrestrial Networks
Yongseong Park, Hyunseok Jeong, Jaeho Jeon, and Young-Sik Kim
Accepted · Grand Prize, 4th KICS HFR Paper Award
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Poly2MsgLeaks: Certified Key Recovery from Polynomial-to-Message Leakage [ePrint]
Yongseong Park, YoungChang Kim, Jeongdo Kim, and Young-Sik Kim
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Falcon Key Recovery from Joint Sampler Leakages [ePrint]
Youngchang Kim, Yongseong Park, Jaeho Jeon, and Young-Sik Kim
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Compression Asymmetry and Trajectory Binding in Noise-Anchored Diffusion Inversion [arXiv]
Yongseong Park, Joeun Kim, HoEun Kim, and Young-Sik Kim
Preprint
Honors & Awards
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Excellence Award, 2026 National Cryptography Contest국가암호공모전 우수상
For the ASIACRYPT 2026 paper on HQC · Category B: Cryptographic Technology Application and Utilization
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Special Award, 2026 National Cryptography Contest국가암호공모전 특별상
For Poly2MsgLeaks: Certified Key Recovery from Polynomial-to-Message Leakage · Category C: KpqC Algorithms and Applications
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Grand Prize, 4th KICS HFR Paper Award제4회 KICS HFR 논문대상 대상
For the OrbitCrypt paper
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Preliminary Round Selection, GRAVITY 2026
Joint startup program of KAIST, DGIST, GIST, and UNIST · Project funding received
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Gold Award, International Collegiate Challenge for AI-Assisted Society (ICCAS)
For Emoseum :: AI Emotion Gallery · Austria
Projects
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Managing equity portfolio risk with reinforcement learning
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Emoseum :: AI Emotion Gallery [GitHub]
A digital therapeutic that turns diary entries into generated images
- Usagi Agent macOS desktop character assistant for tasks, meetings, and research runs Electron · TypeScript
- tzb Two-way PDF highlight sync between Zotero and Tine Python · Homebrew
- Research Agent Kit Shared research rules and skills for Codex and Claude Code Shell
- Panguri Discord bot that reads text chat aloud in voice channels Python · edge-tts
- SafePark Web dashboard for an IoT smart parking system Next.js · TypeScript
- Thumbnail Maker Simple thumbnail generator for tech blog posts React · html2canvas
- OJP SAT math practice question recommendation site React · Vite
- AutoRift Balanced 5v5 team matcher for League of Legends custom games Next.js · Riot API
- Egym Workout diary web app JavaScript · Python
Skills
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Post-Quantum Cryptography (HQC, ML-KEM, ML-DSA), Side-Channel Analysis, Power Trace Analysis
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ARM Cortex-M4, Verilog/RTL, Oscilloscope Capture Setup
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Non-Terrestrial Networks (NTN), Post-Quantum Handover, Session Resumption
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PyTorch, NumPy, Diffusion Models, LoRA, DPO, Differential Privacy
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C, C++, Python, ARM Assembly
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Git, LaTeX