Bibhas Chandra Das

Senior Research Fellow, IAI – TCG CREST

Research Interests

My current research work is Design and Analysis of Efficient Symmetric Searchable Encryption (SSE). Our primary aim is to analyze and understand the limitations of the existing Dynamic SSE schemes, and design new efficient state-of-the-art SSE schemes. Here are the main problems that I have focused in my thesis:

Analyzing the state-of-the-art SSE schemes.
Designing an Efficient Post-Quantum Secure Conjunctive Dynamic SSE scheme:
Designing Efficient Verifiable Dynamic SSE Construction.

In addition, I am also interested in Zero-Knowledge Proofs, BlockChain, Lattices, and Combinatorial Cryptography.

Education and Background

M.Tech Cryptology and Security at Indian Statistical Institute, Kolkata
M.Sc in Pure Mathematics from IIT Madras
B.Sc in Mathematics from Ramakrishna Mission Vidyamandira, Belur

Academic Activities and Achievements

Had a single-author paper “Conjunctive Dynamic SSE Schemes Under Scrutiny: Exposing Privacy Issues in SDSSE-CQ-S and VCDSSE” at AFRICACRYPT 2025.
Subreviewer at AsiaCCS 2025, ASIACRYPT 2024.
Spent six months at University of Warwick, UK for my master’s dissertation. There I worked under Dr. Feng Hao in the area of E-Voting and Zero-Knowledge Proof of Works.

Publications

Bibhas Chandra Das: Conjunctive Dynamic SSE Schemes Under Scrutiny: Exposing Privacy Issues in SDSSE-CQ-S and VCDSSE. AFRICACRYPT 2025: 417-440 [Link]
Bibhas Chandra Das, Nilanjan Datta, Avishek Majumder, Subhabrata Samajder: Fault-tolerant Verifiable Dynamic SSE with Forward and Backward Privacy. IACR Communications in Cryptology. 1(4): 7 (2024)[Link]

Ongoing / Submitted Works

Efficient and Post-Quantum Conjunctive Dynamic SSE with Strong Privacy Guarantees
Do it Faster: Quantum Safe Conjunctive SSE Based On NTRU
Designing Efficient and Quantum Safe Framework for Conjunctive Searchable Symmetric Encryption