I am currently an Associate Researcher at Southeast University in Nanjing, China. Prior to this role, I worked shortly as a specially appointed Assistant Professor at Osaka University. I got my Ph.D. in cryptography from Kyoto University, Japan, under the supervision of Mehdi Tibouchi and Masayuki Abe. Before pursuing my studies in Japan, I completed 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

Academic Service

• Program Committee: Latincrypt 2023, ACNS 2024, ISC 2025, CANS 2025
• (sub)-Reviewer: TCC 2021, Eurocrypt 2022, Eurocrypt 2023, CT-RSA 2023, Crypto 2023, Inscrypt 2023, IEEE S&P 2024, Asiacrypt 2024, PQCrypto 2025, Journal of Cryptology, Discrete Applied Mathematics, Theoretical Computer Science.

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