Jian Guo

My name is Jian Guo, I am currently an Associate Professor (with tenure) with School of Physical and Mathematical Sciences, Nanyang Technological University in Singapore. My research interests focus on symmetric-key cryptography, especially cryptanalysis, design and implementation of (lightweight) hash functions, block ciphers, authenticated encryption schemes, and their applications such as message authentication codes. As such, I head the Cryptanalysis Taskforce research team at NTU, publish papers, give talks, and also actively serve the community. My team and I have won several open competitions on cryptanalysis on various symmetric-key cryptography standards.

I am constantly looking for PhD candidates (refer to this page) and Postdoc Research Fellows on both symmetric-key cryptography and privacy-preserving technologies, feel free to contact me for more information.

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Recent Services / Appointments


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Government Agencies / Organizations






2023/12: Invited talk at ASK 2023 and ChinaCrypt 2023 on "A Realistic Summary and Projection of Cryptanalysis"
2022/12: Invited talk at Asiacrypt 2022 on "Evolution of Cryptanalysis: Security Updates on SHA-3 and AES Hashing"
2022/11: Joint with L. Song and H. Wang, the paper entitled "Key Structures: Improved Related-Key Boomerang Attack against the Full AES-256" won the Best Paper Award of ACISP 2022. The paper improves the attack with lowest time complexity from 2^99 to 2^91 with the access to more related keys.
2022/04: Lanuch of Master of Science in Cyber Security.
2022/03/24: humbled to receive SPMS Young Reseacher Award 2021.
2022/02/14: News release by NTU/SPMS on the organization of Asiacrypt 2021.
2021/11/17: thanks to all for electing me to the IACR Board of Directors (Term 2022-2024), as promised I will do my best to promote research, education, and collaborations in the crypto community. References: the IACR 2021 Election and news release by NTU/SPMS.
2021/03: The first preimage attack against 8-round AES hashing: news release by NTU/CoS, eprint
2019/03: Invited talk at FSE 2019 on "Security of SHA-3 and Related Constructions"
2018-02-08: Joint with C. Chaigneau, T. Fuhr, H. Gilbert, J. Guo, J. Jean, J. R. Reinhard, L. Song, the paper entitled "Key-Recovery Attacks on Full Kravatte" won the Best Paper Award of FSE 2018. The paper broke the full Kravatte (a PRF design based on the SHA-3 round function), and several subsequent patched versions.


01.2007 - 09.2010 Doctor of Mathematical Sciences School of Physical and Mathematical Sciences
PhD Supervisor: Huaxiong Wang Nanyang Technological University, Singapore

08.2003 - 11.2006 Bachelor of Engineering School of Computer Engineering
(with First Class Honors) Nanyang Technological University, Singapore
FYP Supervisor: Suiping Zhou


03.2013 - present Nanyang Technological University, Singapore
09.2010 - 02.2013 Institute for Infocomm Research, Singapore
01.2007 - 09.2010 Nanyang Technological University, Singapore



Email: guojian [at] ntu.edu.sg
Address: School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371.