Dr. Avik Chakraborti

Assistant Professor, IAI TCG CREST

Research and Education

I work in the field of symmetric key cryptography with a special interest in the design and analysis of symmetric ciphers. My research interest primarily includes the design and analysis of authenticated encryption, lightweight cryptography, provable security, security analysis of symmetric modes, searchable encryption, etc. I am also interested in the cryptanalysis of primitives and symmetric quantum algorithms.

I obtained my PhD and post-graduation in Computer Science from Indian Statistical Institute, Kolkata. After PhD, I was an Post Doctoral Fellow at NTT Laboratories, Japan for three years, Lecturer cum Post Doctoral Fellow at R. C. Bose Centre for Cryptology and Security, Indian Statistical Institute, Kolkata for six months, and a Lecturer at the University of Exeter for two years. 



Here is a list of the courses offered by me:

  • Research Scholars, IAI – TCG CREST (Session 2021-22)
  • Research Scholars, IAI – TCG CREST (Session 2021-22)
    • Research Methodology (with Prof. Rana Barua)
    • Advanced Cryptology (with Dr. Avijit Dutta)
    • Discrete Mathematics (with Dr. Avijit Dutta)
    • Automata and Formal Languages (with Prof. Rana Barua)

  • M.Tech Students, ISI Kolkata (Session 2019-20)
    • Computing Systems Security I
    • Cryptology (with Prof. Mridul Nandi)
    • Topics in Cryptology



I am one of the co-designers of the misuse resistant authenticated encryption mode ELmD, which is currently named COLM after merging with COPA. The design is selected as the winner in “Defense in Depth” category of the CAESAR competition. This work is also invited for publication of a special issue in the Journal of Cryptology. I am a co-designer of the sponge based authenticated cipher Photon Beetle, which is one of the finalists of the ongoing NIST Lightweight Competition. I am also a co-designer of all the three finalists of Lightweight Cipher Design Challenge 2020 organized by National CoE, the joint initiative of the Data security council of India (DSCI) and the Ministry of Electronics and IT (MeitY). 



This is a list of important publications. Please refer to my DBLP for the full list of publications.

  • Avik Chakraborti, Nilanjan Datta, Ashwin Jha, Cuauhtemoc Mancillas-López, Mridul Nandi: tHyENA: Making HyENA Even Smaller. INDOCRYPT 2021: 26-48
  • Avik Chakraborti, Nilanjan Datta, Ashwin JhaCuauhtemoc Mancillas-LópezMridul NandiYu Sasaki: Elastic-Tweak: A Framework for Short Tweak Tweakable Block Cipher. INDOCRYPT 2021: 114-137
  • Avik Chakraborti, Nilanjan Datta, Ashwin Jha, Cuauhtemoc Mancillas-Lopez, Mridul Nandi, Yu Sasaki, ESTATE: A Lightweight and Low Energy Authenticated Encryption Mode. IACR Trans. Symmetric Cryptol. 2020(S1): 350-389 (2020)
  • Avik Chakraborti, Nilanjan Datta, Ashwin Jha, Snehal Mitragotri, Mridul Nandi, From Combined to Hybrid: Making Feedback-based AE even Smaller. IACR Trans. Symmetric Cryptol. 2020(S1): 417-445 (2020)
  • Avik Chakraborti, Nilanjan Datta, Mridul Nandi, Kan Yasuda, Beetle Family of Lightweight and Secure Authenticated Encryption Ciphers. IACR Trans. Cryptogr. Hardw. Embed. Syst. 2018(2): 218-241 (2018)
  • Avik Chakraborti, Nilanjan Datta, Mridul Nandi: INT-RUP Analysis of Block-cipher Based Authenticated Encryption Schemes. CT-RSA 2016: 39-54

Contact: avik.chakraborti@tcgcrest.org / 📞 79807 20012