Sujoy Sinha Roy

Ass.Prof. PhD

Secure Systems, Assistant Professor

Dr. Sujoy Sinha Roy is renowned for his expertise in the secure and efficient implementation of cryptographic algorithms across both hardware and software platforms. He possesses a unique talent for comprehending the intricate mathematics behind novel cryptographic algorithms while simultaneously developing original hardware architectures for their execution. Dr. Sinha Roy's research has primarily focused on the field of post-quantum cryptography. Among his notable contributions in this area is the design of the SABER key encapsulation mechanism, which achieved recognition as one of the top four finalists in the NIST's Post Quantum Cryptography (PQC) standardization project. He has also proposed comprehensive implementations of PQC, encompassing hardware, software, embedded systems, and measures to protect against side-channel vulnerabilities. In addition to his work in post-quantum cryptography, Dr. Sinha Roy has devoted his research efforts to the development of hardware acceleration techniques for accelerating the speed of Fully Homomorphic Encryption (FHE). He has co-authored several papers on this subject, which have been presented at prestigious venues. His contributions to the field continue to be highly regarded by his peers and colleagues. He received the PhD degree in 2017 with 'Summa cum laude with congratulations from the examination committee' from COSIC, KU Leuven, Belgium. His doctoral thesis was awarded the 'IBM Innovation Award 2018' that recognizes an outstanding doctoral thesis in informatics. Before joining TU Graz, he worked as an assistant professor at the University of Birmingham's Security and Privacy group, from Sep 2018 to Nov 2020.  
Sujoy Sinha Roy


Bachelors and Masters project topics

Master projects

Bachelors projects

Ongoing third-party funded projects

  • Secure and efficient implementation of Post-quantum Cryptography
  • Hardware acceleration of Homomorphic encryption

Postdoctoral researchers

Current PhD researchers

Current MSc project researchers

  • Ian Khodachenko
  • Florian Krieger
  • Michael Streibl
  • Daniel Sanz Sobrino
  • Constantin Piber
  • Slaven Vidaković


Publications in 2021-24

  • 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. IACR Trans. Cryptogr. Hardw. Embed. Syst. 2024(1).
  • 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. In Design Automation and Test (DATE) 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 AikataAhmet Can MertDavid JacqueminAmitabh DasDonald MatthewsSantosh GhoshSujoy Sinha Roy: A Unified Cryptoprocessor for Lattice-based Signature and Key-exchange. Accepted for publication in IEEE Transactions on Computers (2023).
  • 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 2 (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)
  • Florian Hirner and Ahmet Can Mert and Sujoy Sinha Roy: PROTEUS: A Tool to generate pipelined Number Theoretic Transform Architectures for FHE and ZKP applications. Cryptology ePrint Archive, Paper 2023/267.
  • 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 RaviMartianus Frederic EzermanShivam BhasinAnupam ChattopadhyaySujoy 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 RaviShivam BhasinSujoy Sinha RoyAnupam 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 RoyAhmet Can MertAikataSunmin KwonYoungsam ShinDonghoon Yoo:
    Accelerator for Computing on Encrypted Data. IACR Cryptol. ePrint Arch. 2021: 1555 (2021)
  • Zhuang XuOwen PembertonSujoy Sinha RoyDavid F. Oswald: Magnifying Side-Channel Leakage of Lattice-Based Cryptosystems with Chosen Ciphertexts: The Case Study of Kyber. IEEE Transactions on Computers 2021.
  • Malik ImranFelipe AlmeidaJaan RaikAndrea BassoSujoy Sinha RoySamuel Pagliarini:
    Design Space Exploration of SABER in 65nm ASIC. ASHES@CCS 2021: 85-90
  • Andrea BassoSujoy Sinha Roy: Optimized Polynomial Multiplier Architectures for Post-Quantum KEM Saber. DAC 2021: 1285-1290


  • Cryptography on Hardware Platform (Winter Semester)
  • Digital System Design (Summer Semester)
  • Cryptography on Software Platform (Summer Semester)