Hanwen Feng

Hanwen Feng

Working on Cryptography, Security, and Consensus

Hi! Welcome to my homepage!

I am currently a postdoctoral researcher at the School of Computer Science, University of Sydney, hosted by Dr. Qiang Tang. Prior to joining USYD, I worked as a senior security engineer at Alibaba Group (2021-2022) and completed my PhD at Beihang University (2017-2021), with a visiting period at the New Jersey Institute of Technology (2019-2020).

My research interests span a broad range of topics in cryptography and security. In the past, I have worked on zero-knowledge proofs, randomness extractors, group and ring signatures, multiparty computation, and differential privacy.

Currently, I am primarily focused on cryptography and consensus challenges in distributed systems. My work aims to enhance the communication and computation efficiency of essential distributed consensus and cryptography protocols, such as distributed key generation, distributed common randomness, and Byzantine agreements, to enable their large-scale deployment.

I am currently on the job market for academic positions.

Selected Publications

Below are selected 10 publications in the last 5 years, which should cover the topics I have worked on. Please see my Google Scholar for a full list.

  • [PODC’24] Dragon: Decentralization at the cost of Representation after Arbitrary Grouping and Its Applications to Sub-cubic DKG and Interactive Consistency (link)
    ACM Symposium on Principles of Distributed Computing (A* Conference)
    Hanwen Feng, Zhenliang Lu, Qiang Tang

  • [CCS’24] Scalable and Adaptively Secure Any-Trust Distributed Key Generation and All-hands Checkpointing (link)
    ACM Conference on Computer and Communications Security (A* Conference)
    Hanwen Feng, Tiancheng Mai, Qiang Tang

  • [VLDB’ 23] OpBoost: A Vertical Federated Tree Boosting Framework Based on Order-Preserving Desensitization (link)
    International Conference on Very Large Data Bases (A* Conference)
    Xiaochen Li, Yuke Hu, Weiran Liu, Hanwen Feng, Li Peng, Hong Yuan, Kui Ren, Zhan Qin

  • [ICDE’ 22] Scape: Scalable Collaborative Analytics System on Private Database with Malicious Security
    International Conference on Data Engineering (A* Conference)
    Han Feng, Lan Zhang, Hanwen Feng, Weiran Liu, Xiangyang Li

  • [CRYPTO’ 21] Witness Authenticating NIZKs and Applications (link)
    Annual International Cryptology Conference (A* Conference)
    Hanwen Feng, Qiang Tang

  • [TCC’ 21] Computational Robust (Fuzzy) Extractors for CRS-dependent Sources with Minimal Entropy (link)
    Theory of Cryptography Conference (A Conference)
    Journal of Cryptology (A* Journal, in Revision)
    Hanwen Feng, Qiang Tang

  • [IEEE TDSC’23]Privacy Enhancements via Dummy Points in the Shuffle Model
    {IEEE Transactions on Dependable and Secure Computing} (A Journal)
    Xiaochen Li, Weiran Liu, Hanwen Feng, Kunzhe Huang, Jinfei Liu, Kui Ren, Zhan Qin

  • [DCC’ 21] Traceable Ring Signatures: General Framework and Post-quantum Security
    International Journal - Designs, Codes and Cryptography (B Journal)
    Hanwen Feng, Jianwei Liu, Dawei Li, Ya-Nan Li, Qianhong Wu

  • [CT-RSA’ 20] Traceable Ring Signatures with Post-quantum Security
    Cryptographer’s Track at RSA Conference (B Conference)
    Hanwen Feng, Jianwei Liu, Ya-Nan Li, Qianhong Wu

  • [ISC’ 19] Secure Stern Signatures in Quantum Random Oracle Model
    Information Security Conference (B Conference)
    Hanwen Feng, Jianwei Liu, Qianhong Wu

Academic Services

I served or am currently serving as a Program Committee member for CCS 2024, PKC 2024, IWSEC 2023.

I served as external reviewers for the following conferences: EUROCRYPT 2023, Okland 2023, CCS 2022, Usenix Security 2022, ASIACRYPT 2022, NDSS 2022, PKC 2022, ASIACRYPT 2021, CTRSA 2022, ACNS 2021, ICISC 2020, ESORICS 2020, ACISP 2020, etc.

Implementaions

I am contributing to mpc4j, a Java-based secure multiparty computation library supported by Alibaba.

Awards & Honors

I received Excellent Doctoral Dissertation Award from Beihang University, Outstanding Graduate Student in Cyber Science scholarship from China Internet Development Foundation, National Scholarship from China MOE, etc.