About Me
I am a researcher primarily working in symmetric-key cryptography. I did my PhD in “Design and Analysis of Lightweight Cryptographic modes” from Indian Statistical Institute, Kolkata under the supervision of professor Mridul Nandi. My research interest includes but is not restricted to:
- Designing Symmetric-Key Primitives
- Provable security Analysis of existing Symmetric-key protocols
- Theoretical Cryptanalysis.
- Algorithmic Cryptanalysis.
- Crypto For AI.
Experience
Cybersecurity Engineer
July, 2025 - Present
Currently I am working as a Cybersecurity Engineer at PERSOLKELLY Singapore Pte Ltd.
Research Fellow
September, 2023 - June, 2025
I worked as a post-doctoral Research Fellow at SyLLab under the mentorship of Professor Thomas Peyrin, in the School of Physical and Mathematical Sciences (SPMS), Nanyang Technological University, Singapore.
Research Scientist
July, 2023 - September, 2023
I worked as a Research Scientist at R. C. Bose Centre for Cryptology and Security, Indian Statistical Institute, Kolkata
Education
Indian Statistical Institute, Kolkata
July, 2016 - April, 2023
Here I received my Ph.D. in Theoretical Computer Science (Cryptography)
Indian Statistical Institute, Kolkata
July, 2013 - May, 2016
Here I received my Master’s degree in Mathematics (M.MATH)
National Institute of Technology, Durgapur
August, 2009 - May, 2013
Here I received my Bachelor’s degree in Electrical Engineering (B.Tech)
Cryptographic Designs
Publications
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B. Chakraborty, M. Nandi, S. Pal, T. Peyrin, Q. Q. Tan “ASCON Revisited: A New State-Recovery Attack and Committing Security in the Multi-User Setting”, in IACR Transactions on Symmetric Cryptology ToSC 2026-3 / Fast Software Encryption - FSE 2027.
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R. Bhaumik, B. Chakraborty, C. Dhar, “Breaking and Fixing MacaKey”, in IACR Transactions on Symmetric Cryptology ToSC 2026-1 / Fast Software Encryption - FSE 2026.
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R. Avanzi, A Chakraborti, B. Chakraborty, E. List, “The Large Block Cipher Family Vistrutah”, in IACR Transactions on Symmetric Cryptology ToSC 2025-3 / Fast Software Encryption - FSE 2026.
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B. Chakraborty, A. Saha, “Tweakable Permutation-based Luby-Rackoff Constructions”, in Advances in Cryptology- CRYPTO 2025.
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R. Bhaumik, B. Chakraborty, W. Choi, A. Dutta, J. Govinden, Y. Shen, “The Committing Security of MACs with Applications to Generic Composition”, in Advances in Cryptology- CRYPTO 2024.
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B. Chakraborty, C. Dhar, M. Nandi, “Tight Multi-user Security of Ascon and Its Large Key Extension”, in Information Security and Privacy - ACISP 2024.
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B. Chakraborty, N. Datta, M. Nandi, “Designing Full-Rate Sponge based AEAD modes”, in Advances in Cryptology - INDOCRYPT 2023.
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B. Chakraborty, C. Dhar, M. Nandi, “Exact Security Analysis of ASCON”, in Advances in Cryptology - ASIACRYPT 2023.
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B. Chakraborty, M. Nandi, “The mF Mode of Authenticated Encryption with Associated Data”, in Journal of Mathematical Cryptology - JMC 2022.
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B. Chakraborty, S. Chattopadhyay, A. Jha, M. Nandi, “On length independent security bounds for the PMAC family”, in IACR Transactions on Symmetric Cryptology ToSC 2021-2 / Fast Software Encryption - FSE 2022.
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B. Chakraborty, A. Jha, M. Nandi, “On the Security of Sponge-type Authenticated Encryption Modes”, in IACR Transactions on Symmetric Cryptology ToSC 2020-2 / Fast Software Encryption - FSE 2021.