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Posts
Some Exercise Answers to A Computational Introduction to Number Theory and Algebra by Victor Shoup (2nd Ed)
Published:
I’m currently learning the basics of number theory and algebra through “A Computational Introduction to Number Theory and Algebra by Victor Shoup”, recommended by my supervisor, Ron Steinfeld. To support others learning independently like myself, I’ll be sharing some of my solutions to the exercises from this book. I hope this will spark discussions and mutual learning. If you spot any inaccuracies or have suggestions, please feel free to reach out at Xinyu.Zhang1@monash.edu. (I’ll continue updating this blog whenever I find some free time, so check back for new insights!)
portfolio
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publications
Revocable and linkable ring signature
Published in International Conference on Information Security and Cryptology (Inscrypt 2019), 2019
Keywords: Ring signature, Ring confidential transaction, Revocability, Linkability
Recommended citation: Zhang, Xinyu, Joseph K. Liu, Ron Steinfeld, Veronika Kuchta, and Jiangshan Yu. "Revocable and linkable ring signature." In Information Security and Cryptology: 15th International Conference, Inscrypt 2019, Nanjing, China, December 6–8, 2019, Revised Selected Papers 15, pp. 3-27. Springer International Publishing, 2020.
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Smooth Transition from PoW to PoS
Published in The 6th ACM International Symposium on Blockchain and Secure Critical Infrastructure (BSCI), 2024
Keywords: Blockchain, Consensus, Proof of Work, Proof of Stake, Transition
DualRing-PRF: Post-Quantum (Linkable) Ring Signatures from Legendre and Power Residue PRFs
Published in The 29th Australasian Conference on Information Security and Privacy (ACISP 2024), 2024
Keywords: Ring Signature; Linkability; Post-Quantum; Symmetric Key Primitives
Recommended citation: Zhang, Xinyu, Ron Steinfeld, Joseph K. Liu, Muhammed F. Esgin, Dongxi Liu, and Sushmita Ruj. "DualRing-PRF: Post-quantum (Linkable) Ring Signatures from Legendre and Power Residue PRFs." In Australasian Conference on Information Security and Privacy, pp. 124-143. Singapore: Springer Nature Singapore, 2024.
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Loquat: A SNARK-Friendly Post-Quantum Signature based on the Legendre PRF with Applications in Ring and Aggregate Signatures
Published in Annual International Cryptology Conference (Crypto), 2024
Keywords: Post-Quantum Signature, Legendre PRF, SNARK, Aggregate Signature, ID-Based Ring Signature
Recommended citation: Zhang, Xinyu, Ron Steinfeld, Muhammed F. Esgin, Joseph K. Liu, Dongxi Liu, and Sushmita Ruj. "Loquat: A SNARK-Friendly Post-quantum Signature Based on the Legendre PRF with Applications in Ring and Aggregate Signatures." In Annual International Cryptology Conference, pp. 3-38. Cham: Springer Nature Switzerland, 2024.
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BDEC: Enhancing Learning Credibility via Post-Quantum Digital Credentials
Published in The 18th International Conference on Provable and Practical Security (ProvSec), 2024
Keywords: Digital Credential; Anonymous; Post-Quantum; Blockchain
Pegasus and PegaRing: Efficient (Ring) Signatures from Sigma-Protocols for Power Residue PRFs with (Q)ROM Security
Published in , 2025
Keywords: Legendre and Power Residue PRFs, Sigma Protocol, Post-Quantum, Signature, Ring Signature, QROM
talks
Post-Quantum Signatures from Symmetric Key Primitives
Published:
The talk introduced various symmetric key primitives-based post-quantum signatures, including hash-based one time signatures, XMSS, SPHINCS+, Picnic, and our work Loquat which was published in Crypto 2024.
Post-Quantum Signatures from Legendre and Power Residue PRFs
Published:
The talk introduced the Legendre and power residue PRFs and our research output related to these PRFs.
teaching
FIT5163 Information and Computer Security
Master course, Monash University, Faculty of Information Technology, 2026
This course is a cryptography foundation unit, students will learn symmetric key cryptography, asymmetric key cryptography such as RSA, DH key exchange, IBE, Schnorr’s signature, ring signature, lightweight cryptosystem, database security etc.
FIT1047 Introduction to Computer Systems, Networks and Security
Undergraduate Course, Monash University, Faculty of Information Technology, 2026
This is a foundation unit for computer science. The unit will cover logic circuit construction, circuit optimization, assembly languages, computer network, and information security.