Publications

CRSP-FL: Efficiently Scaling Private Frequency Estimation to Resolve Data Heterogeneity in Federated Learning

Harish Karthikeyan

SHARP-FL: Single-Round Global Frequency Reweighting for Private Federated Learning

Harish Karthikeyan

OPA Sketched: Breaking the Secure Aggregation Tax for Communication Efficient Private Federated Learning

Harish Karthikeyan

TAPAS: Efficient Two-Server Asymmetric Private Aggregation Beyond Prio(+)

Harish Karthikeyan and Antigoni Polychroniadou

HashMark: Watermarking Tabular (Synthetic) Data For Machine Learning Via Cryptographic Hash Functions

Harish Karthikeyan, Leo de Castro, Antigoni Polychroniadou, Manuela Veloso, Tucker Balch

Regulatable ML @NeurIPS2025, NeurIPS 2025 Workshop on GenAI in Finance

AgentCrypt: Advancing Privacy and Secure Computation in AI Agent Collaboration

Harish Karthikeyan, Yue Guo, Leo de Castro, Antigoni Polychroniadou, Leo Ardon, Udari Madhushani Sehwag, Sumitra Ganesh, Manuela Veloso

Regulatable ML @NeurIPS2025,NeurIPS 2025 Workshop on Scaling Environments for Agents

Armadillo: Robust Secure Aggregation for Federated Learning with Input Validation

Yiping Ma, Yue Guo, Harish Karthikeyan, Antigoni Polychroniadou

Early version: NeurIPS 2024 AIM-FM Workshop

OPA: One-shot Private Aggregation with Single Client Interaction and its Applications to Federated Learning

Harish Karthikeyan and Antigoni Polychroniadou

Early versions: TPMPC ’25 · NeurIPS ’24 Workshop · AAAI ’25 Workshop

PriDeCT: Towards Public Consensus, Private Transactions, and Forward Secrecy in Decentralized Payments

Yue Guo, Harish Karthikeyan, Antigoni Polychroniadou

Combining Forward-Security and Leakage-Resilience, Revisited

Suvradip Chakraborty, Harish Karthikeyan, Adam O'Neill, C. Pandu Rangan

Forward-Secure Encryption with Fast Forwarding

Yevgeniy Dodis, Daniel Jost, and Harish Karthikeyan

On Seedless PRNGs and Premature Next

Sandro Coretti, Yevgeniy Dodis, Harish Karthikeyan, Noah Stephens-Davidowitz, Stefano Tessaro

Encapsulated Search Index: Public-Key, Sub-linear, Distributed, and Delegatable

Erik Aronesty, David Cash, Yevgeniy Dodis, Daniel H. Gallancy, Christopher Highley, Harish Karthikeyan, Oren Tysor

Small-Box Cryptography

Yevgeniy Dodis, Harish Karthikeyan, and Daniel Wichs

Updatable Public Key Encryption in the Standard Model

Yevgeniy Dodis, Harish Karthikeyan, and Daniel Wichs

Seedless Fruit is the Sweetest: Random Number Generation, Revisited

Sandro Coretti, Yevgeniy Dodis, Harish Karthikeyan, Stefano Tessaro

An Efficient Multiple PKG Compatible Identity Based Authenticated Key Agreement Protocol

Harish Karthikeyan, Suvradip Chakraborty, Kunwar Singh, C. Pandu Rangan

Accepted at Inscrypt 2015