1. NDSS

   On the Security Risks of Memory Adaptation and Augmentation in Data-plane DoS Mitigation

   Hocheol Nam, Daehyun Lim, Huancheng Zhou, Guofei Gu, and Min Suk Kang

   Network and Distributed System Security Symposium (NDSS), San Diego, CA, USA, 2026

   We introduce ‘Heracles attack’ that uncover security risks in adaptive data-plane DoS defenses in programmable switches, and propose a new sketch mechnaism ‘Shield’ to mitigate Heracles attack.

   PDF DOI GitHub Zenodo Details

   BibTeX

   @inproceedings{nam2026heracles,
     title = {{On the Security Risks of Memory Adaptation and Augmentation in Data-plane DoS Mitigation}},
     author = {Nam, Hocheol and Lim, Daehyun and Zhou, Huancheng and Gu, Guofei and Kang, Min Suk},
     booktitle = {Proceedings of the 2026 Network and Distributed System Security Symposium (NDSS'26)},
     pages = {1-20},
     year = {2026},
   }
   

2. CCS

   On Frontrunning Risks in Batch-Order Fair Systems for Blockchains

   Eunchan Park, Taeung Yoon, Hocheol Nam, Deepak Maram, and Min Suk Kang

   ACM SIGSAC Conference on Computer and Communications Security (CCS), Taipei, Taiwan, 2025

   We examine frontrunning risks in batch-order fair blockchain systems (like Themis [CCS’23]) and propose the ‘Ambush attack’ that enables frontrunning attacks that remain possible despite fair-ordering guarantees.

   PDF Full version DOI GitHub Zenodo Details

   BibTeX

   @inproceedings{park2025frontrunning,
     title = {{On Frontrunning Risks in Batch-Order Fair Systems for Blockchains}},
     author={Park, Eunchan and Yoon, Taeung and Nam, Hocheol and Maram, Deepak and Kang, Min Suk},
     booktitle = {Proceedings of the 32nd ACM Conference on Computer and Communications Security (CCS)},
     year = {2025},
   }
   

3. ICSE

   Fork State-Aware Differential Fuzzing for Blockchain Consensus Implementations

   Wonhoi Kim^*, Hocheol Nam^*, Muoi Tran, Amin Jalilov, Zhenkai Liang, Sang Kil Cha, and Min Suk Kang

   IEEE/ACM International Conference on Software Engineering (ICSE), Ottawa, ON, Canada, 2025

   We introduce Forky, a fork state-aware differential fuzzing framework for finding semantic discrepancies in blockchain consensus implementations. We test Forky on Bitcoin and Ethereum, which are the representatives of the two major blockchain consensus algorithm families, PoW and PoS consensus algorithms.

   ^*Co-first authors

   PDF DOI GitHub Zenodo Details

   BibTeX

   @inproceedings{kim2025fork,
     title = {{Fork State-Aware Differential Fuzzing for Blockchain Consensus Implementations}},
     author = {Wonhoi Kim and Hocheol Nam and Muoi Tran and Amin Jalilov and Zhenkai Liang and Sang Kil Cha and Min Suk Kang},
     booktitle = {Proceedings of the 47th IEEE/ACM International Conference on Software Engineering (ICSE'25)},
     pages = {3048-3059},
     year = {2025},
   }
   

4. FC

   Short Paper: On the Claims of Weak Block Synchronization in Bitcoin

   Seungjin Baek^*, Hocheol Nam^*, Yongwoo Oh, Muoi Tran, and Min Suk Kang

   Financial Cryptography and Data Security (FC), St. George's, Grenada, 2022

   We re-evaluates claims that Bitcoin has slow block propagation. We show that block synchronization is actually fast enough, and that previous slow-propagation claims stemmed from bugs and limits in monitoring tools. We finally ask several open-ended questions regarding the technical and ethical issues around monitoring blockchain networks.

   ^*Co-first authors

   PDF DOI Preprint Details

   BibTeX

   @inproceedings{baek2022short,
     title={{Short paper: On the claims of weak block synchronization in Bitcoin}},
     author={Baek, Seungjin and Nam, Hocheol and Oh, Yongwoo and Tran, Muoi and Kang, Min Suk},
     booktitle={International Conference on Financial Cryptography and Data Security (FC)},
     pages={663--671},
     year={2022},
     organization={Springer}
   }
   

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