Ashrujit Ghoshal

I am a fourth year PhD student in the theory group of Paul G. Allen School of Computer Science and Engineering at the University of Washington, Seattle, USA. I am advised by Stefano Tessaro and Rachel Lin. I spent the summer of 2021 as a research intern at NTT Research Sunnyvale working with Ilan Komargodski. My current research interests lie mainly in the theory and foundations of cryptography.

Prior to this I graduated from the Indian Institute of Technology Kharagpur in July 2018 with a Bachelor of Technology (Hons.) in Computer Science and Engineering. I was advised by Debdeep Mukhopadhyay for my undergraduate thesis.

Publications and Manuscripts

Hiding in Plain Sight: Memory-tight Proofs via Randomness Programming
Ashrujit Ghoshal, Riddhi Ghosal, Joseph Jaeger, Stefano Tessaro [eprint]

Tight State-Restoration Soundness in the Algebraic Group Model
Ashrujit Ghoshal and Stefano Tessaro [eprint] [doi] [talk] [slides]

The Memory-Tightness of Authenticated Encryption
Ashrujit Ghoshal, Joseph Jaeger, Stefano Tessaro [eprint] [doi] [talk] [slides]

On the Memory-Tightness of Hashed ElGamal
Ashrujit Ghoshal and Stefano Tessaro [eprint] [doi] [talk] [slides]

Lightweight and Side-channel Secure 4 × 4 S-Boxes from Cellular Automata Rules [eprint] [doi]
Ashrujit Ghoshal, Rajat Sadhukhan, Sikhar Patranabis, Nilanjan Datta, Stjepan Picek, Debdeep Mukhopadhyay
IACR Transactions on Symmetric Cryptology, 2018(3) and FSE 2019

Template-Based Fault Injection Analysis of Block Ciphers [eprint] [doi]
Ashrujit Ghoshal, Sikhar Patranabis, Debdeep Mukhopadhyay
SPACE 2018

Several Masked Implementations of the Boyar-Peralta AES S-Box [eprint] [doi]
Ashrujit Ghoshal and Thomas De Cnudde

An Evaluation of Lightweight Block Ciphers for Resource-Constrained Applications: Area, Performance, and Security [doi]
Rajat Sadhukhan, Sikhar Patranabis, Ashrujit Ghoshal, Debdeep Mukhopadhyay, Vishal Saraswat, Santosh Ghosh
Journal of Hardware and Systems Security 2017


Implementation Attacks on Block Ciphers: New Approaches and Countermeasures [pdf]
Bachelors Thesis