Research

My primary research interest is the provable security analysis of symmetric-key cryptographic modes using combinatorial techniques. My doctoral research focused on provable security against a classical adversary. At Inria, I started exploring the exciting new field of provable security against a quantum adversary, as part of the ERC project QUASYModo. At present I am studying proof frameworks for adapting classical counting techniques in post-quantum security proofs.

My complete academic CV (last updated in August 2023) can be found here.

You can also visit my DBLP page here.

Publications

On Quantum-Secure Compressing Pseudorandom Functions.
Asiacrypt '23 (to appear).
(with Benoît Cogliati, Jordan Ethan and Ashwin Jha)

BBB-Security for 5-Round Even-Mansour-Based Key-Alternating Feistel Ciphers.
Design, Codes and Cryptography (to appear).
(with Arghya Bhattacharjee, Avijit Dutta, Mridul Nandi and Anik Raychaudhuri)

PAE: Towards More Efficient and BBB-secure AE From a Single Public Permutation.
ICICS '23 (to appear).
(with Arghya Bhattacharjee, Avijit Dutta and Eik List)

Revisiting the Indifferentiability of the Sum of Permutations.
Crypto '23.
(with Aldo Gunsing, Ashwin Jha, Bart Mennink and Yaobin Shen)

Offset-Based BBB-Secure Tweakable Block-ciphers with Updatable Caches.
Indocrypt '22.
(with Arghya Bhattacharjee and Mridul Nandi)

A Sponge-Based PRF with Good Multi-user Security.
Selected Areas in Cryptography '22 (to appear).
(with Arghya Bhattacharjee and Mridul Nandi)

Improved indifferentiability security proof for 3-round tweakable Luby-Rackoff.
Design, Codes and Cryptography.
(with Mridul Nandi and Anik Raychaudhuri)

QCB: Efficient Quantum-Secure Authenticated Encryption.
Asiacrypt '21.
(with Xavier Bonnetain, André Chailloux, Gaëtan Leurent, María Naya-Plasencia, André Schrottenloher and Yannick Seurin)

ZCZ: Achieving n-bit SPRP Security with a Minimal Number of Tweakable-Block-Cipher Calls.
Asiacrypt '18.
(with Eik List and Mridul Nandi)

Turning Online Ciphers Off.
Transactions on Symmetric Cryptology.
(with Elena Andreeva, Guy Barwell, Mridul Nandi, Dan Page and Martijn Stam)

Improved Security for OCB3.
Asiacrypt '17.
(with Mridul Nandi)

The Iterated Random Function Problem.
Asiacrypt '17.
(with Nilanjan Datta, Avijit Dutta, Nicky Mouha and Mridul Nandi)

OleF: an Inverse-Free Online Cipher.
Transactions on Symmetric Cryptology.
(with Mridul Nandi)

An Inverse-Free Single-Keyed Tweakable Enciphering Scheme.
Asiacrypt '15.
(with Mridul Nandi)

Preprints

Indifferentiability of 6-round Feistel.
(with Mridul Nandi, Sayantan Paul and Abishanka Saha)

Robust Online Authenticated Encryption and Bidirectional Online Channels.
(with Arghya Bhattacharjee, Daniel Collins and Mridul Nandi)

Block-cipher Doubling for a Post-Quantum World.
(with André Chailloux, Paul Frixons, Bart Mennink and María Naya-Plasencia)