Sabyasahi Karati

Research

Journals

  1. Encoding to Legendre Curve, Kummer Line and Twisted Edwards Curve:
    G. Saha and S. Karati,
    Journal of Advances in Mathematics of Communications, AIMS, Doi: 10.3934/amc.2026014, 2026. (pdf)

  2. DGMT: A Fully Dynamic Group Signature From Symmetric-Key Primitives:
    M. Fadavi, S. Karati, A. Erfanian and R. Safavi-Naini,
    Cryptograpy, Volume 9, Number 1: 12, 2025. (pdf)

  3. Kummer for Genus One over Prime-Order Fields:
    S. Karati and P. Sarkar,
    Journal of Cryptology, Volume 33, Number 1, pp 92–129, Springer, 2020. (pdf)

  4. Connecting Legendre with Kummer and Edwards,
    S. Karati and P. Sarkar,
    Journal of Advances in Mathematics of Communications, AIMS, Volume 13, Issue 1, pp 41-66, 2019. (pdf)

  5. New algorithms for batch verification of standard ECDSA signatures:
    S. Karati, A. Das, D. Roychowdhury, B. Bellur, D. Bhattacharya and A. Iyer,
    Journal of Cryptographic Engineering, Springer, Volume 4, Issue 4, pp 237-258, 2014. (pdf)

Conferences

  1. DGSP: An Efficient Scalable Fully Dynamic Group Signature Scheme Using SPHINCS+:
    S.-A. Azimi, M. Fadavi, S Jaques and S. Karati,
    Eurocrypt 2026, Rome, Italy. To Appear.

  2. An Improved Differential Fault Attack on the Stream Cipher Espresso:
    D. Das, A. Ghatak, I. Gupta, S. Karati and A. Mandal,
    Indocrypt 2024, Chennai, India. (pdf)

  3. Kummer and Hessian meet in the Field of Characteristic 2:
    S. Karati and G. Saha,
    Indocrypt 2023, Goa, India. (pdf)

  4. Binary Kummer Line:
    S. Karati,
    ACNS 2023, Kyoto, Japan. (pdf)

  5. An Intermediate Secret-Guessing Attack on Hash-Based Signatures:
    R. Booth, Y. Xu, S. Karati and R. Safavi-Naini,
    IWSEC 2021, Tokyo, Japan. (pdf)

  6. K2SN-MSS: An Efficient Post-Quantum Signature:
    S. Karati, and R. Safavi-Naini,
    ACM ASIACCS 2019, Auckland, New Zealand. (pdf)

  7. Kummer for Genus One over Prime Order Fields:
    S. Karati, and P. Sarkar,
    AsiaCrypt 2017, Hong Kong, China. (Invited to Journal of Cryptology). (pdf)

  8. Faster batch verification of standard ECDSA signatures using summation polynomials:
    S. Karati and A. Das,
    ACNS 2014, Lausanne, Switzerland. (pdf)

  9. Randomized batch verification of standard ECDSA signatures:
    S. Karati, A. Das and D. Roychoudhury,
    SPACE 2014, Pune, India. (pdf)

  10. Batch verification of EdDSA signatures:
    S. Karati and A. Das,
    SPACE 2014, Pune, India. (pdf)

  11. Batch verification of ECDSA signatures:
    S. Karati, A. Das, D. Roychowdhury, B. Bellur, D. Bhattacharya and A. Iyer,
    AfricaCrypt 2012, Ifrane, Morocco. (pdf)

  12. Use of SIMD features to speed up eta pairing:
    A. Bhattacharya, S. Karati, A. Das, D. Roychowdhury, B. Bellur, and A. Iyer,
    ICETE 2012, Rome, Italy. (pdf)

IACR ePrint

  1. DGSP: An Efficient Scalable Fully Dynamic Group Signature Scheme Using SPHINCS+:
    M. Fadavi, S. A. Azimi, S. Karati and S. Jaques,
    2025: 760

  2. DGMT: A Fully Dynamic Group Signature From Symmetric-key Primitives:
    M. Fadavi, S. Karati, A. Erfanian and R. Safavi-Naini,
    2024: 1942

  3. An Intermediate Secret-Guessing Attack on Hash-Based Signatures (Full Version):
    R. Booth, Y. Xu, S. Karati and R. Safavi-Naini,
    2021: 845

  4. Binary Kummer Line:
    S. Karati,
    2019: 1316

  5. K2SN-MSS: An Efficient Post-Quantum Signature (Full Version):
    S. Karati and R. Safavi-Naini,
    2019: 442

  6. Connecting Legendre with Kummer and Edwards:
    S. Karati and P. Sarkar,
    2017: 1205

  7. Kummer for Genus One over Prime Order Fields:
    S. Karati and P. Sarkar,
    2016: 938

  8. Using Randomizers for Batch Verification of ECDSA Signatures:
    S. Karati, A. Das and D. Roychowdhury,
    2012: 582

PhD Thesis