Chaoyun Li

2025

• LightCROSS: A Secure and Memory Optimized Post-Quantum Digital Signature CROSS.
  Harry Hart, Puja Mondal, Suparna Kundu, Supriya Adhikary, Angshuman Karmakar, Chaoyun Li.
  preprint
• A Survey on Transciphering and Symmetric Ciphers for Homomorphic Encryption.
  Indranil Thakur, Angshuman Karmakar, Chaoyun Li, Bart Preneel.
  preprint
• Full Key Extraction of SNOW-V Using ML-Assisted Power SCA.
  Harshit Saurabh, Suparna Kundu, Samarth Shivakumar Titti, Anupam Golder, K. K. Soundra Pandian, Chaoyun Li, Angshuman Karmakar, and Debayan Das
  IEEE Design & Test 42(2), 2025

2024

• SNOW-SCA: ML-assisted Side-Channel Attack on SNOW-V.
  Harshit Saurabh, Anupam Golder, Samarth Shivakumar Titti, Suparna Kundu, Chaoyun Li, Angshuman Karmakar, and Debayan Das
  IEEE International Symposium on Hardware Oriented Security and Trust (HOST) 2024

2023

• Enhancing 5G Security: A Comparison of 256-bit Symmetric-key Cryptosystems on FPGA
  Ryan De Koninck, Chaoyun Li, Furkan Turan, Jonas Bertels, Ingrid Verbauwhede, Bart Preneel
  preprint
• Stream Ciphers
  Chaoyun Li, Bart Preneel
  Chapter 2 in Symmetric Cryptography, Volume 1: Design and Security Proofs, edited by Christina Boura and Maria Naya-Plasencia

2022

• ECDSA White-Box Implementations: Attacks and Designs from WhibOx 2021 Contest
  Guillaume Barbu, Ward Beullens, Emmanuelle Dottax, Christophe Giraud, Agathe Houzelot, Chaoyun Li, Mohammad Mahzoun, Adrián Ranea, Jianrui Xie
  IACR Transactions on Cryptographic Hardware and Embedded Systems (TCHES), 2022(4)

2021

• Statistical Fault Analysis of the Simeck Lightweight Cipher in the Ubiquitous Sensor Networks
  Wei Li, Jiayao Li, Dawu Gu, Chaoyun Li, Tianpei Cai
  IEEE Transactions on Information Forensics and Security, 2021
• Towards Practical Intrusion Detection System over Encrypted Traffic
  Sébastien Canard and Chaoyun Li
  IET Information Security, 2021

2020

• New Methods for Symmetric Cryptography
  Chaoyun Li, Supervisor: Bart Preneel
  PhD thesis, KU Leuven, 2020
• Links between Division Property and Other Cube Attack Variants
  Yonglin Hao, Takanori Isobe, Lin Jiao, Chaoyun Li, Willi Meier, Yosuke Todo, Qingju Wang
  IACR Transactions on Symmetric Cryptology 2020(1)

2019

• Lightweight Iterative MDS Matrices: How Small Can We Go?
  Shun Li, Siwei Sun, Danping Shi, Chaoyun Li, Lei Hu
  IACR Transactions on Symmetric Cryptology 2019(4)
• Improved Division Property Based Cube Attacks Exploiting Algebraic Properties of Superpoly
  Yonglin Hao, Takanori Isobe, Lin Jiao, Chaoyun Li, Willi Meier, Yosuke Todo, Qingju Wang
  IEEE Transactions on Computers
  This is a extended jorunal version of the CRYPTO 2018 paper.
• Correlation of Quadratic Boolean Functions: Cryptanalysis of All Versions of Full MORUS
  Danping Shi, Siwei Sun, Yu Sasaki, Chaoyun Li, Lei Hu
  CRYPTO 2019
• Improved Interpolation Attacks on Cryptographic Primitives of Low Algebraic Degree
  Chaoyun Li, Bart Preneel
  Selected Areas in Cryptography 2019
• Binary sequences with period \(N\) and nonlinear complexity \(N-2\)
  Zibi Xiao, Xiangyong Zeng, Chaoyun Li, Yupeng Jiang
  Cryptography and Communications, 2019
• Constructing Low-latency Involutory MDS Matrices with Lightweight Circuit
  Shun Li, Siwei Sun, Chaoyun Li, Zihao Wei, Lei Hu
  IACR Transactions on Symmetric Cryptology 2019(1)
• New classes of complete permutation polynomials
  Lisha Li, Chaoyun Li, Chunlei Li, Xiangyong Zeng
  Finite Fields and Their Applications, 2019
• Ciphertext-only Fault Analysis on the LED Lightweight Cryptosystem in the Internet of Things
  Wei Li, Linfeng Liao, Dawu Gu, Chaoyun Li, Chenyu Ge, Zheng Guo, Ya Liu, Zhiqiang Liu
  IEEE Transactions on Dependable and Secure Computing, 2019 [url]

2018

• Impossible meet-in-the-middle fault analysis on the LED lightweight cipher in VANETs
  Wei Li, Vincent Rijmen, Zhi Tao, Qingju Wang, Hua Chen, Yunwen Liu, Chaoyun Li, Ya Liu
  SCIENCE CHINA Information Sciences , 2018
• Improved Division Property Based Cube Attacks Exploiting Algebraic Properties of Superpoly
  Qingju Wang, Yonglin Hao, Yosuke Todo, Chaoyun Li, Takanori Isobe, Willi Meier
  CRYPTO 2018
• Permutation Polynomials \((x^{p^m}-x+\delta)^{s_{1}}+(x^{p^m}-x+\delta)^{s_{2}}+x\) over \(\mathbb{F}_{p^{n}}\)
  Lisha Li, Wangshi, Chaoyun Li, Xiangyong Zeng
  Finite Fields and Their Applications, 2018

2017

• Design of Lightweight Linear Diffusion Layers from Near-MDS Matrices
  Chaoyun Li, Qingju Wang
  IACR Transactions on Symmetric Cryptology 2017(1)

2016

• Construction of de Bruijn Sequences From LFSRs With Reducible Characteristic Polynomials.
  Chaoyun Li, Xiangyong Zeng, Chunlei Li, Tor Helleseth, Ming Li
  IEEE Transactions on Information Theory, 2016

2014

• A Class of de Bruijn Sequences
  Chaoyun Li, Xiangyong Zeng, Chunlei Li, Tor Helleseth
  IEEE Transactions on Information Theory, 2014
• The Properties of a Class of Linear FSRs and Their Applications to the Construction of Nonlinear FSRs
  Chaoyun Li, Xiangyong Zeng, Tor Helleseth, Chunlei Li, Lei Hu
  IEEE Transactions on Information Theory, 2014

Preprints

• Cryptanalysis of the MALICIOUS Framework
  Tim Beyne and Chaoyun Li
  IACR ePrint, 2020
• Observations on the Dynamic Cube Attack of 855-round Trivium from Crypto’18
  Yonglin Hao, Lin Jiao, Chaoyun Li, Willi Meier, Yosuke Todo, Qingju Wang
  IACR ePrint, 2018

Awards and Achievements

• FWO Junior Postdoc Fellowship, 2020 - 2023
• Winner of CHES 2021 Challenge WhibOx Contest 2021 for best implementations, 2021
• Marie Skłodowska-Curie ESR Fellow, 2015 - 2019
  

Mentoring

PhD students
• Maxine Collins, 10/2025-present
• Harry Hart, 01/2025-present
Master students
• Ryan De Koninck
• Edward Wiels
• Michiel Verbauwhede
• Xueming Zhong

Talks

• 2023 International Workshop on Coding Theory and Cryptography
  Invited talk, Wuhan, 19/08/2023
• CHES 2022
  Leuven, 20/09/2022
• Fault attacks
  Hubei University, virtual, 05/02/2021
• Cryptography: Theory and Practice
  Chinese Academy of Sciences, virtual, 12/10/2020
• Improved Interpolation Attacks on Cryptographic Primitives of Low Algebraic Degree
  SAC 2019, Waterloo, Canada, 14/08/2019
• Cube Attacks on Stream Ciphers for FHE
  Orange Labs, Caen, France, 24/10/2017
• Cube Attacks on Stream Ciphers Based on Division Property Slides
  ECRYPT School on Correct and Secure Implementation, Crete, Greece, 12/10/2017
• An Overview of Cube Attacks
  University of Bergen, Bergen, Norway, 03/08/2017
• Design of Lightweight Linear Diffusion Layers from Near-MDS Matrices Slides
  FSE 2017, Tokyo, Japan, 06/03/2017
• Advanced Methods for Symmetric Cryptanalysis
  ECRYPT Cloud Summer School, Leuven, Belgium, 22/09/2016

Visits

• Chinese Academy of Science, Beijing, China
  07/2023-07/2023
• Orange Labs, Caen, France
  15/09/2017-15/12/2017
• Selmer Center, University of Bergen, Bergen, Norway
  10/07/2017-09/08/2017

Program Committees

• Indocrypt 2022-2025
• IMACC 2021

Reviewer for Journals

• IEEE Transactions on Information Theory
• IEEE Transactions on Computers
• Designs, Codes and Cryptography
• Finite Fields and Their Applications
• The Computer Journal
• Cryptography and Communications
• Information Processing Letters
• IET Information Security
• SCIENCE CHINA Information Sciences
• Applicable Algebra in Engineering, Communication and Computing
• ETRI Journal

Subreviewer for Conferences

• INDOCRYPT 2017
• FSE 2018/ToSC 2018(1)
• EUROCRYPT 2019
• FSE 2020/ToSC 2020(1)
• CT-RSA 2021