Hi

I am a postdoc researcher at CISPA, hosted by Doreen Riepel. Previously, I was a postdoc at both Georgia Institute of Technology (GT) and Purdue University (2023-2025), hosted by Vassilis Zikas. I received my doctoral degree from Shanghai Jiao Tong University in 2023, under the supervision of Shengli Liu. Prior to that, I obtained my master's and bachelor's degrees from Sun Yat-Sen University in 2018 and 2016, respectively, under the supervision by Fangguo Zhang.

I am interested in cryptography and security in general. During my PhD my research mainly focuses on tight security. Currently I am working on advanced signature schemes, blockchain and MPC.

• (June 2025) Glad to join CISPA.

• (Apr. 2025) I write a blog for my 40k hiking at Grand Canyon (during spring break).

• (Mar. 2025) I finished Spartan Beast Race (21k, 30 obstacles). See my blog here.

• (Dec. 2024) Glad to join the PC of Africacrypt 2025. Thanks for inviting me!

• (Nov. 2024) Congratulations! I regained the skill of backflip (后空翻) and had a breakthrough on frontflip (前空翻). See backflip and frontflip for the videos ^o^.

• (Sept. 2024) Congratulations! I got the skill of side flip with a twist (侧空翻转体). See here for the video ^o^.

• (Sept. 2024) Glad to join the PC of FC 2025 and PKC 2025. Thanks for inviting me!

• (Aug. 2024) I am very glad to join Georgia Institute of Technology as a postdoc researcher, and start my new life in Atlanta (and also Purdue in West Lafayette :D).

• (Aug. 2024) I created a log to record my exercise. Inspired by the Paris Olympics 2024, I hope this log will help me stay youthful, energetic, passionful, and always hold a hope to the life. Faster, higher, stronger. Keep up the good work, and may your journal inspire you to reach new heights!

• (Dec. 2023) I added a part of google map (see below) to record my footprints over the world.

• (Nov. 2023) I won the 2023 Outstanding Doctoral Dissertation Award of Chinese Association for Cryptologic Research (CACR).

• (Sept. 2023) Congratulations! I have re-unlocked Muscle Ups (双力臂) since 2018. See here for the video ^o^.

• Traceable Ring Signatures Revisited: Extended Definitions, O(1) Tracing, and Efficient Log-Size Constructions
  Xiangyu Liu
  [ePrint]

• Deniable Symmetric Signcryption (anonymized title)
  Wonseok Choi, Daniel Collins, Joseph Jaeger, Akshaya Kumar, Xiangyu Liu, Vassilis Zikas
  [to appear]

• A Unified Treatment of Anamorphic Encryption
  Wonseok Choi, Daniel Collins, Xiangyu Liu, Vassilis Zikas
  [ePrint]

• K-Linkable Ring Signatures and Applications in Generalized Voting
  Wonseok Choi, Xiangyu Liu, Lirong Xia, Vassilis Zikas
  [ePrint]

• CVICA: Coordinated Vehicle Infrastructure Cryptography Architecture with Fine-Grained Access Control
  Shiqi Ou, Xiangyu Liu
  [here]
  Note: The technical novelty in this paper is negligible—particularly in cryptography, and it is not intended for publication. Rather, it serves as a personal memento of the authors' Ph.D. journey and a witness for Hoco.

• Anonymous Authentication and Key Agreement, Revisited
  Yanqi Zhao, Xiangyu Liu, Min Xie, Xiaoyi Yang, Jianting Ning, Baodong Qin, Haibin Zhang, Yong Yu
  ACSAC 2025 [ePrint]

• Blockchain Governance via Sharp Anonymous Multisignatures
  Wonseok Choi, Xiangyu Liu, Vassilis Zikas
  AFT 2025 [conference version] [ePrint] [slides]

• Universal Adaptor Signatures from Blackbox Multi-Party Computation
  Michele Ciampi, Xiangyu Liu, Ioannis Tzannetos, Vassilis Zikas
  CT-RSA 2025 [conference version] [ePrint] [slides]

• Adaptor Signatures: New Security Definition and A Generic Construction for NP Relations
  Xiangyu Liu, Ioannis Tzannetos, Vassilis Zikas
  ASIACRYPT 2024 [conference version] [ePrint] [slides]

• Fine-grained Verifier NIZK and Its Applications
  Xiangyu Liu, Shengli Liu, Shuai Han, Dawu Gu
  PKC 2023 [conference version] [eprint] [slides]

• EKE Meets Tight Security in the Universally Composable Framework
  Xiangyu Liu, Shengli Liu, Shuai Han, Dawu Gu
  PKC 2023 [conference version] [eprint] [slides]

• Tightly CCA-Secure Inner Product Functional Encryption Scheme
  Xiangyu Liu, Shengli Liu, Dawu Gu
  Theoretical Computer Science 2022 [journal version]

• Two-Pass Authenticated Key Exchange with Explicit Authentication and Tight Security
  Xiangyu Liu, Shengli Liu, Dawu Gu, Jian Weng
  ASIACRYPT 2020 [conference version] [eprint] [slides]

• Tightly Secure Chameleon Hash Functions in the Multi-User Setting and Their Applications
  Xiangyu Liu, Shengli Liu, Dawu Gu
  ACISP 2020 [conference version] [eprint] [slides]

• Tightly Secure Identity-Based Signature Scheme
  Xiangyu Liu, Shengli Liu, Dawu Gu
  Journal of Cryptologic Research, 2021

• A Dynamic Searchable Encryption Scheme on Cloud Storage with Multi-level Access
  Xiangyu Liu, Huige Li, Fangguo Zhang
  Journal of Cryptologic Research, 2019

• Program Committee Member:
  PKC 2025/2027; FC 2025; Africacrypt 2025/2026.
  

• Conference External Reviewer:
  CRYPTO 2024-2026, EUROCRYPT 2022/2023/2026, ASIACRYPT 2022-2024, PKC 2022/2025, ISC 2024, APKC 2021/2022, ICDCS 2022, Inscrypt 2021, ProvSec 2021, ACISP 2020, ProvSec 2020.
  

• Journal External Reviewer:
  Journal of Cryptology (JoC), Transactions on Dependable and Secure Computing (TDSC), The Computer Journal, Internet of Things (IoT), Computer Standards & Interfaces (CSI), Transactions on Privacy and Security (TOPS).
  

I am interested in all kinds of sports like wushu (martial arts), judo, free running, gymnastics, climbing, hiking, badminton, table tennis, etc. One of my dreams is, to perform a flip (空翻) when I am 80 years old.

Sometimes I play the flute, though I am musically challenged to be honest. Hope you never have to suffer through my singing.

I am thinking about to upload my sport videos into Bilibili/Youtube? Hope you will see them very soon...

I enjoy adventure and have a dream of traveling around the world. I hope to keep walking and continuously explore this vast world. I record my footprints here.