Cryptographic Metamorphosis: Bridging Realms and Fostering Futures

Speaker:

Dr. XIAO Liang
Postdoctoral Fellow
NTT Research

Abstract:
Modern cryptography has evolved beyond its initial focus on information privacy and has become deeply integrated into various aspects of computer science. An extraordinary example in this regard is the “love-hate” relationship between Cryptography and Quantum Computing, which stands among the central topics of today’s theoretical computer science (TCS) research. On the one hand, quantum techniques (e.g., Shor’s algorithm) jeopardize the foundational assumptions for Cryptography; on the other hand, the unique features of quantum information (e.g., Heisenberg’s Uncertainty Principle) enable new cryptographic functionalities that were provably impossible in a classical world. A key focus of this talk will be my effort in re-establishing the quantum theory for central cryptography tasks like Secure Multi-Party Computation (MPC) and Zero-Knowledge (ZK) Proofs, underscoring the role of this interdisciplinary field as a fertile ground for both classical and quantum TCS innovations.

As for the “classical” aspect of my research, I will discuss my pursuits in designing concurrently-secure, black-box MPC (and ZK) protocols, addressing the inherent tension between security and efficiency. I will also talk about my passion for leveraging cryptography for system/network security tasks, instantiating my belief in bridging theoretical research with real-world applications.

The presentation will culminate with an outline of a future research agenda, as well as my aspirations to contribute to the CSE department, including the designs of a new course on mathematical tools for TCS, a new course on quantum cryptography, and a semi-annual “Crypto-Plus” seminar in Hong Kong.

Biography:
Xiao LIANG is currently a Postdoctoral Fellow at NTT Research, specializing in Cryptography. Prior to this role, he gained valuable postdoctoral experience at Rice University and Indiana University Bloomington. His expertise encompasses Zero-Knowledge Protocols, Secure Multi-Party Computation, Non-Malleability, and Digital Signature, with a deliberate effort to establish connections with adjacent domains like System/Network Security. A notable highlight of Xiao’s work is the emphasis on the convergence of cryptography and quantum computing, contributing to the dynamic interdisciplinary advancements in this burgeoning field. His research has consistently resulted in publications at esteemed conferences for both cryptography and theoretical computer science in general, such as FOCS, CRYPTO, and ICALP. Xiao Liang holds a Ph.D. in Computer Science and an M.S. in Applied Mathematics, both earned from Stony Brook University, and a B.S. in Economics from Beijing Institute of Technology.

Enquiries:

Mr. WONG O-Bong (obong@cse.cuhk.edu.hk)

Ms. FUNG Wing Chi Mary (maryfung@cse.cuhk.edu.hk)