Sujoy Sinha Roy

Dr. Sujoy Sinha Roy is an Associate Professor at TU Graz, specializing in secure and efficient cryptographic algorithms on hardware and software platforms. He is known for his work in post-quantum cryptography (SABER KEM design, efficient software and hardware implementations, and side-channel security assessment) and Fully Homomorphic Encryption (FHE design, hardware acceleration, and application). Dr. Sinha Roy earned his PhD in 2017 from KU Leuven, receiving the IBM Innovation Award for his thesis. Before TU Graz, he was an assistant professor at the University of Birmingham. He obtained his habilitation in January 2024.

Teaching

• Digital System Design
• Cryptography on Hardware Platform
• Cryptography on Software Platform

Focus area

• Post-quantum cryptography
• Privacy-preserving cryptographic techniques
• Cryptographic proofs

Past PhD students

• Andrea Basso (co-supervised, currently a postdoc at IBM Zurich)

Past postdocs

• Ahmet Can Mert (Founded startup in Zero-Knowledge Proof)

Current PhD researchers

• Aikata
• Anisha Mukherjee
• David Jacqemin
• Florian Hirner
• Florian Krieger

Photo taken when we were trying to find a patent idea in Tesla's research lab.

Reviewer in Conference PC

DATE 2025, TCHES 2025, TCHES 2024, DAC 2024, DATE 2024, ICCD 2024, SAC 2024, CT-RSA 2024, ...

  Associate Editor

Elsevier Journal of Information Security and Applications

  Publications in 2021-24

• Florian Krieger, Florian Hirner, Sujoy Sinha Roy, "Exploring Large Integer Multiplication for Cryptography Targeting In-Memory Computing". Accepted in DATE 2025.
• Aikata Aikata, Daniel Sanz Sobrino and Sujoy Sinha Roy, "PASTA on Edge: Cryptoprocessor for Hybrid Homomorphic Encryption". Accepted in DATE 2025.
• Aikata Aikata, Sujoy Sinha Roy, "Secure and Efficient Outsourced Matrix Multiplication with Homomorphic Encryption". Accepted in Indocrypt 2024.
• Florian Hirner, Michael Streibl, Florian Krieger, Ahmet Can Mert, Sujoy Sinha Roy, "Whipping the MAYO Signature Scheme using Hardware Platforms". Accepted in ACM CCS 2024.
• Florian Krieger, Florian Hirner, Ahmet Can Mert, Sujoy Sinha Roy, "OpenNTT - An Automated Toolchain for Compiling High-Performance NTT Accelerators in FHE". Invited Paper in ACM/IEEE ICCAD 2024.
• Andrey Kim, Ahmet Can Mert, Anisha Mukherjee, Aikata, Maxim Deryabin, Sunmin Kwon, HyungChul Kang, Sujoy Sinha Roy, "Exploring the Advantages and Challenges of Fermat NTT in FHE Acceleration". CRYPTO 2024.
• Samuel Pagliarini, Aikata Aikata, Malik Imran, and Sujoy Sinha Roy, “REPQC: Reverse Engineering and Backdooring Hardware Accelerators for Post-quantum Cryptography”. AsiaCCS 2024.
• Florian Hirner, Ahmet Can Mert and Sujoy Sinha Roy, "PROTEUS: A Tool to generate pipelined Number Theoretic Transform Architectures for FHE and ZKP applications". IEEE Transaction on VLSI 2024.
• Anisha Mukherjee, Aikata, Ahmet Can Mert, Yongwoo Lee, Sunmin Kwon, Maxim Deryabin, Sujoy Sinha Roy, "ModHE: Modular Homomorphic Encryption Using Module Lattices: Potentials and Limitations". TCHES 2024.
• Florian Krieger, Florian Hirner, Ahmet Can Mert, and Sujoy Sinha Roy, "Aloha-HE: A Low-Area Hardware Accelerator for Client-Side Operations in Homomorphic Encryption". DATE 2024.
• Malik Imran, Aikata Aikata, Sujoy Sinha Roy, Samuel Pagliarini: High-speed Design of Post Quantum Cryptography with Optimized Hashing and Multiplication. IEEE Transactions on Circuits and Systems II: Express Briefs ( Volume: 71, Issue: 2, February 2024).
• Aikata, Ahmet Can Mert, Sunmin Kwon, Maxim Deryabin, Sujoy Sinha Roy: REED: Chiplet-Based Scalable Hardware Accelerator for Fully Homomorphic Encryption. CoRR abs/2308.02885 (2023)
• David Jacquemin, Anisha Mukherjee, Sujoy Sinha Roy, Péter Kutas: Towards a constant-time implementation of isogeny-based signature, SQISign. IACR Cryptol. ePrint Arch. 2023: 807 (2023)
• Florian Hirner, Michael Streibl, Ahmet Can Mert, Sujoy Sinha Roy: A Hardware Implementation of MAYO Signature Scheme. IACR Cryptol. ePrint Arch. 2023: 1267 (2023)
• David Jacquemin, Anisha Mukherjee, Ahmet Can Mert, Sujoy Sinha Roy: Parallel Hardware for Isogeny-based VDF: Attacker's Perspective. IACR Cryptol. ePrint Arch. 2023: 1396 (2023)
• Aikata Aikata and Andrea Basso and Gaetan Cassiers and Ahmet Can Mert and Sujoy Sinha Roy: Kavach: Lightweight masking techniques for polynomial arithmetic in lattice-based cryptography. IACR Trans. Cryptogr. Hardw. Embed. Syst. 2023(3).
• Ahmet Can Mert and Aikata and Sunmin Kwon and Youngsam Shin and Donghoon Yoo and Yongwoo Lee and Sujoy Sinha Roy: Medha: Microcoded Hardware Accelerator for computing on Encrypted Data. IACR Trans. Cryptogr. Hardw. Embed. Syst. 2023(1).
• Aikata Aikata and Ahmet Can Mert and Malik Imran and Samuel Pagliarini and Sujoy Sinha Roy: KaLi: A Crystal for Post-Quantum Security Using Kyber and Dilithium. IEEE Transactions on Circuits and Systems 1 (2023).
• Aikata Aikata, Ahmet Can Mert, David Jacquemin, Amitabh Das, Donald Matthews, Santosh Ghosh, Sujoy Sinha Roy: A Unified Cryptoprocessor for Lattice-based Signature and Key-exchange. Accepted for publication in IEEE Transactions on Computers (2023).
• Malik Imran, Felipe Almeida, Andrea Basso, Sujoy Sinha Roy, Samuel Pagliarini: High-speed SABER Key Encapsulation Mechanism in 65nm CMOS. Journal of Cryptographic Engineering 2023.
• Sujoy Sinha Roy and Utsav Banerjee: Preventing a Crypto-Apocalypse -- From Mathematics to Circuits for Post-Quantum Cryptography. IEEE Solid-State Circuits Magazine ( Volume: 15, Issue: 1, winter 2023)
• Prasanna Ravi, Shivam Bhasin, Anupam Chattopadhyay, Aikata, Sujoy Sinha Roy: Backdooring Post-Quantum Cryptography: Kleptographic Attacks on Lattice-based KEMs. IACR Cryptol. ePrint Arch. 2022: 1681 (2022).
• David Jacquemin and Ahmet Can Mert and Sujoy Sinha Roy: Exploring RNS for Isogeny-based Cryptography. IACR Cryptol. ePrint Arch. 2022: 1289 (2022)
• Jipeng Zhang and Junhao Huang and Zhe Liu and Sujoy Sinha Roy: Time-memory Trade-offs for Saber+ on Memory-constrained RISC-V. IEEE Transactions on Computers 2022.
• Prasanna Ravi, Martianus Frederic Ezerman, Shivam Bhasin, Anupam Chattopadhyay, Sujoy Sinha Roy: Will You Cross the Threshold for Me? Generic Side-Channel Assisted Chosen-Ciphertext Attacks on NTRU-based KEMs. IACR Trans. Cryptogr. Hardw. Embed. Syst. 2022(1): 722-761 (2022).
• Prasanna Ravi, Shivam Bhasin, Sujoy Sinha Roy, Anupam Chattopadhyay: On Exploiting Message Leakage in (few) NIST PQC Candidates for Practical Message Recovery and Key Recovery Attacks. IEEE Transactions on Information Forensics and Security 2021.
• Sujoy Sinha Roy, Ahmet Can Mert, Aikata, Sunmin Kwon, Youngsam Shin, Donghoon Yoo: Accelerator for Computing on Encrypted Data. IACR Cryptol. ePrint Arch. 2021: 1555 (2021)
• Zhuang Xu, Owen Pemberton, Sujoy Sinha Roy, David F. Oswald: Magnifying Side-Channel Leakage of Lattice-Based Cryptosystems with Chosen Ciphertexts: The Case Study of Kyber. IEEE Transactions on Computers 2021.
• Malik Imran, Felipe Almeida, Jaan Raik, Andrea Basso, Sujoy Sinha Roy, Samuel Pagliarini: Design Space Exploration of SABER in 65nm ASIC. ASHES@CCS 2021: 85-90
• Andrea Basso, Sujoy Sinha Roy: Optimized Polynomial Multiplier Architectures for Post-Quantum KEM Saber. DAC 2021: 1285-1290