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April 24 10:30 am - 11:30 am EDT
Title: Secure Multiparty Computation and Broadcast
Speaker: Ran Cohen, Northeastern University Cybersecurity & Privacy Institute
Date: Wednesday, April 24, 2019
Time: 10:30am – 11:30am
Location: Northeastern University, 601 Interdisciplinary Science & Engineering Complex (ISEC), 805 Columbus Ave, Boston, MA 02120
Host: Abhi Shelat
Secure multiparty computation (MPC) is one of the greatest achievements of modern cryptography. It allow a set of mutually distrusting parties to jointly compute functions over their inputs while protecting their privacy and guaranteeing correctness. The task of broadcast, where a designated sender reliably sends his message to all other parties, is a special case of MPC.
Many MPC protocols consider broadcast as an atomic resource of the communication model, thus achieving optimality in terms of security guarantees, communication-efficiency, and required cryptographic assumptions. However, broadcasting messages as an atomic operation is a strong assumption that cannot be realized in many real-life settings. Using broadcast protocols in a naive way affects the aforementioned results both in terms of feasibility and of efficiency.
In this talk I will explore secure computation over point-to-point channels, where a broadcast channel is not available, and tackle various aspects of this question: (1) how to achieve the best security guarantees, (2) how to efficiently use secure protocols as sub-routines in higher-level protocols, and (3) how to design protocols for the large-scale setting.
About the Speaker
Ran Cohen is a post-doctoral researcher at Northeastern University and MIT, working with Professor Abhi Shelat and Professor Shafi Goldwasser. Prior to joining Northeastern he was a post-doctoral researcher at Tel Aviv University. Ran received his PhD in Computer Science from Bar-Ilan University in 2016, where he was advised by Professor Yehuda Lindell.