Welcome to CryptoPlus!

We are passionate about cryptography and its rich connections to fields such as computational complexity, algorithms, quantum computing, and system/network security. Modern cryptography sits at the intersection of these areas, offering a dynamic space for exploration.

At CryptoPlus, our odyssey begins in the "hometown" of cryptography, but extends beyond advancing cryptography alone. We view cryptography not only as a discipline, but also as a playground for engaging with tools from mathematics, computer science, and even physics. These tools share a spirit of scientific curiosity and creativity — the spirit that drives our work and shapes our lab's intellectual environment. We aim to develop creative ideas that advance cryptography and reach into other areas, first through cryptographic thinking and eventually beyond — a vision reflected in our name: CryptoPlus!

Members


Faculty Member: Ph.D. Students:
  • Chak Fai Yung   (08/2026 - present)
    B.S. from The Chinese University of Hong Kong
  • Ziqing Guo   (08/2025 - present)
    M.Eng. and B.Eng. from Huazhong University of Science and Technology
  • Chenya Sun   (08/2025 - present)
    B.Eng. from Beihang University
Research Assistants:
  • Qian Liu   (06/2026 - 08/2026)
    Ph.D. student at University of Hong Kong
  • Vir Pathak   (06/2026 - 08/2026)
    Ph.D. student at Stony Brook University
  • Chak Fai Yung   (10/2024 - 07/2026)
    Bachelor's student at The Chinese University of Hong Kong
  • King-Siong Si   (11/2025 - 03/2026)
    Master's student at Xi'an Jiaotong University
M.Phil. Students:
  • Wenhui Zhang   (08/2025 - present)
    B.Eng. from Hunan University
  • Wenqi Xu   (08/2026 - present)
    B.S. from Hong Kong Polytechnic University

Visitors


  • Barbara Benedikt   (02/2026)
    Ph.D. student at Technical University of Darmstadt
  • Xinyu Mao   (01/2026)
    Ph.D. student at University of Southern California
  • Alper Çakan   (09/2025)
    Ph.D. student at Carnegie Mellon University
  • Rohit Chatterjee   (08/2025)
    Postdoctoral Researcher at National University of Singapore
  • Yuhao Tang   (12/2024)
    Ph.D. student at Stony Brook University

Seminars


2026-02-05 The Order of Hashing in Fiat-Shamir Schemes
[Video: YouTube, bilibili]     Speaker: Barbara Benedikt (Technical University of Darmstadt)
2026-01-09 Black-Box Separation between Multi-Collision Resistance and Collision Resistance
[Video: YouTube, bilibili]     Speaker: Xinyu Mao (University of Southern California)
2025-12-23 How to Prove Post-Quantum Security for Succinct Non-Interactive Reductions
[Video: YouTube, bilibili]     Speaker: Yuxi Zheng (EPFL)
2025-09-03 Public-Key Quantum Fire and Key-Fire from Classical Oracles
[Video: YouTube, bilibili]     Speaker: Alper Çakan (Carnegie Mellon University)
2025-08-12 Recent Advances in Adaptively Secure Threshold Signatures
[Video: YouTube, bilibili]     Speaker: Yanbo Chen (University of Ottawa)
2025-08-11 Are Uncloneable Proof and Advice States Strictly Necessary?
[Video: YouTube, bilibili]     Speaker: Rohit Chatterjee (National University of Singapore)
2025-02-18 Constructing Low-depth Pseudorandom Functions from LPN
[Video: YouTube, bilibili]     Speaker: Youlong Ding (Hebrew University of Jerusalem)
2024-11-21 Instance-Hiding Interactive Proofs
[Video: YouTube, bilibili]     Speaker: Changrui Mu (National University of Singapore)

Publications   (In accordance with the tradition of theoretical computer science, authors are listed in alphabetical order)


  1. The Black-Box Simulation Barrier Persists in a Fully Quantum World
    Nai-Hui Chia, Kai-Min Chung, Xiao Liang, Jiahui Liu
    Eurocrypt 2026     [PDF] [Slides] [Video]
  2. Round-Efficient Composable Two-Party Quantum Computation
    Vipul Goyal, Xiao Liang, Omkant Pandey, Yuhao Tang, Takashi Yamakawa
    Asiacrypt 2025    
  3. Almost-Total Puzzles and Their Applications
    Xiao Liang, Omkant Pandey, Yuhao Tang, Takashi Yamakawa
    Asiacrypt 2025     [PDF]
  4. The Round Complexity of Black-Box Post-Quantum Secure Computation
    Rohit Chatterjee, Xiao Liang, Omkant Pandey, Takashi Yamakawa
    Crypto 2025     [PDF]