About Me

I am a cryptographer and a postdoctoral fellow in the School of Cybersecurity and Privacy at Georgia Tech, working with Vassilis Zikas. I have broad interests across both theoretical and applied cryptography. Currently, I work on the foundations of secure distributed computation: how mutually distrusting parties can compute, agree, and generate shared randomness over real networks. In these networks, messages may be delayed, communication links may be missing, a majority of participants may be corrupted, and many protocols run side by side.

My research spans secure multiparty computation (MPC), fault-tolerant distributed protocols (Byzantine agreement, broadcast, and distributed randomness), composable security, and black-box compilers. Across these topics, I combine lower bounds with new round-efficient constructions, and I aim for security guarantees that survive composition and real-world deployment. More broadly, I develop theory that is both motivated by and relevant to more realistic practical settings. My results appear in venues such as TCC and the Journal of Cryptology. I have also brought this work to industry, through a research internship at Input Output Global on composable security for smart contracts and decentralized applications, and through industry-sponsored research on round-efficient Byzantine agreement.

I received my PhD in Computer Science from Texas A&M University in 2025, advised by Juan Garay. My dissertation was on the secure composition of asynchronous cryptographic protocols. Before that, I earned an MS in Electrical Engineering (Secure Communication and Cryptography) from Sharif University of Technology.

Also, my ErdΕ‘s number is 3. πŸ™‚

Research

News

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Selected Publications

TCC 2026

On the Round Complexity of Dishonest-Majority MPC

Ran Cohen, Daniel Collins, Pouyan Forghani, Juan Garay, and Vassilis Zikas
Theory of Cryptography Conference (TCC 2026) (to appear)
JoC

Universally Composable Almost-Everywhere Secure Computation

Nishanth Chandran, Pouyan Forghani, Juan Garay, Rafail Ostrovsky, Rutvik Patel, and Vassilis Zikas
Journal of Cryptology, 39(1), 2026
Preliminary version in the 3rd Conference on Information-Theoretic Cryptography (ITC 2022).
TCC 2025

Is It Even Possible? On the Parallel Composition of Asynchronous MPC Protocols

Ran Cohen, Pouyan Forghani, Juan Garay, Rutvik Patel, and Vassilis Zikas
Theory of Cryptography Conference (TCC 2025), 2025
TCC 2023

Concurrent Asynchronous Byzantine Agreement in Expected-Constant Rounds, Revisited

Ran Cohen, Pouyan Forghani, Juan Garay, Rutvik Patel, and Vassilis Zikas
Theory of Cryptography Conference (TCC 2023), 2023

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