Jian Guo

My name is Jian Guo, I am currently working 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 lead 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.

PGP Public Key

Recent Services / Appointments


Research Community

Government Agencies / Organizations


  • Consultant for problems in areas of cryptography and cybersecurity



  • Best Paper Awards: FSE 2018, ACISP 2022

  • NTU/SPMS Collaborative Research Award 2022 (Co-PI)

  • NTU/SPMS Young Researcher Award 2021

  • NTU Accelerating Creativity and Excellence Award 2020 (Co-PI)

  • Best Publication Awards by Temasek Labs@NTU 2015, 2016, 2017

  • Winner of The Keccak Crunchy Crypto Collision and Pre-image Contest, for several occasions in 2012~2019


  • [New] The application deadline of the August 2023 batch of Master of Science in Cyber Security program is 28th February 2023

  • [New] 2022/09: There are multiple open positions of (senior) postdoc research fellows and PhD students with full scholarship support, on the topic of symmetric-key cryptography including but not limited to quantum attacks, cryptanalysis of AES and SHA-3, FHE/MPC friendly designs, automatic tools or machine learning for cryptanalysis: https://www.iacr.org/jobs/item/3107

  • To my potential PhD or Final Year Project students, refer to this page for information.


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.
News release by NTU/SPMS on the organization of Asiacrypt 2021.
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


Discrete Mathematics: AY14/15 S2, AY15/16 S2, AY18/19 S1, AY19/20 S1, AY19/20 S2, AY20/21 S1, AY20/21 S2, AY21/22 S1, AY21/22 S2, AY22/23 S1
Algorithms and Computing II: AY17/18 S2, AY18/19 S2


Email: guojian [at] ntu.edu.sg
Address: School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371.
Tel: (+65) 6514 8399