I am a (specially appointed) assistant professor at Osaka Univeristy. I got my Ph.D in cryptography at Kyoto university in Japan, supervised by Mehdi Tibouchi and Masayuki Abe. Before coming to Japan, I got my bachelor’s degree at Peking University.

Research Interest

Mathematical Aspects of Cryptography, Post-quantum Cryptography, Lattice Cryptography, Cryptanalysis.

Email Address

sunchaopku12345 at gmail dot com

Education

• Ph.D in Cryptography, Kyoto University, Apr 2020 ~ Mar 2023 (Supervisor: Mehdi Tibouchi, Masayuki Abe)
• M.S. in Cryptography, Kyoto University, Apr 2018 ~ Mar 2020 (Supervisor: Mehdi Tibouchi, Masayuki Abe)
• Research Student, University of Tokyo, Oct 2016 ~ Sep 2017
• B.S. in Computer Science and Technology, Peking University, Sep 2012 ~ Jul 2016

Work Experience

• (Specially Appointed) Assistant Professor, Osaka University, Apr 2023 ~

• Research Internship in Lattice Cryptography, NTT Social Informatics Laboratories. Feb, Oct 2021; May 2022

Academic Service

• Program Committee: Latincrypt 2023, ACNS 2024
• Reviewer: TCC 2021, Eurocrypt 2022, Eurocrypt 2023, CT-RSA 2023, Crypto 2023, Inscrypt 2023, IEEE S&P 2024, Journal of Cryptology, Discrete Applied Mathematics.

Publications and Talks

• Thomas Espitau, Thi Thu Quyen Nguyen, Chao Sun, Mehdi Tibouchi, Alexandre Wallet, “Antrag: Annular NTRU Trapdoor Generation”, Asiacrypt 2023.
• Thomas Espitau, Guilhem Niot, Chao Sun, Mehdi Tibouchi, “Squirrels: Square Unstructured Integer Euclidean Lattice Signature”, Round 1 candidate of NIST Additional Call for Post-quantum Digital Signature Schemes.
• Chao Sun, Thomas Espitau, Mehdi Tibouchi, Masayuki Abe, “Guessing Bits: Improved Lattice Attacks on (EC)DSA with Nonce Leakage”, IACR Transactions on Cryptographic Hardware and Embedded Systems (TCHES), Volume 2022, Issue 1.
• Chao Sun, Mehdi Tibouchi, Masayuki Abe, “Revisiting the Hardness of Binary Error LWE”, The 27th Australasian Conference on Information Security and Privacy (ACISP 2020).
• Chao Sun, Thomas Espitau, Mehdi Tibouchi, Masayuki Abe, “Generating Falcon Trapdoors via Gibbs Sampler”, 2023 Symposium on Cryptography and Information Security.
• Chao Sun, Thomas Espitau, Mehdi Tibouchi, Masayuki Abe, “Optimal Lattice Trapdoor for the Klein-GPV and Peikert Sampler”, 2022 Symposium on Cryptography and Information Security.
• Chao Sun, Mehdi Tibouchi, Masayuki Abe. “Towards Improving Lattice Attacks on (EC)DSA”, 2021 Symposium on Cryptography and Information Security.
• Chao Sun, Mehdi Tibouchi, Masayuki Abe. “On the hardness of LWE with Non-Uniform Binary-Error”, 2020 Symposium on Cryptography and Information Security.
• Chao Sun, Mehdi Tibouchi, Masayuki Abe. “Sample-Time Trade-off for the Arora-Ge Attack on Binary-Error LWE”, 2019 Symposium on Cryptography and Information Security.

Techniques, SKills and Others

• Languages: Chinese (native), English (fluent), Japanese (conversational)
• Hobby: Soccer, Cycling, Hiking