Ewa Syta

Source: CyLab

This event is part of the CyLab Seminar Series and is made possible by a generous grant from the Ripple University Blockchain Research Initiative.

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Speaker: Ewa Syta, assistant professor of Computer Science at Trinity College

Title: CALYPSO: Private Data Management for Decentralized Ledgers

Distributed ledgers provide high availability and integrity, making them a key enabler for practical and secure computation of distributed workloads among mutually distrustful parties. Many practical applications also require strong confidentiality, however. Syta will present CALYPSO, an approach to enhance permissioned and permissionless blockchains with the ability to manage confidential data without forfeiting availability or decentralization.

The proposed CALYPSO architecture addresses two orthogonal challenges confronting modern distributed ledgers:

  1. enabling the auditable management of secrets
  2. protecting distributed computations against arbitrage attacks when their results depend on the ordering and secrecy of inputs.

CALYPSO introduces on-chain secrets, a novel abstraction that enforces atomic deposition of an auditable trace whenever users access confidential data. CALYPSO provides user-controlled consent management that ensures revocation atomicity and accountable anonymity. To enable permissionless deployment, we introduce an incentive scheme and provide users with the option to select their preferred trustees. We evaluated our CALYPSO prototype with a confidential document-sharing application and a decentralized lottery. Our benchmarks show that transaction-processing latency increases linearly in terms of security (number of trustees) and is in the range of 0.2 to 8 seconds for 16 to 128 trustees.


Ewa Syta is an assistant professor of computer science at Trinity College in Hartford, CT. She received her Ph.D. in computer science from Yale University, and received her B.S. and M.S. in computer science with a specialization in cryptology from Military University of Technology in Poland. Her research interests are in computer security and distributed systems, with a focus on applied and theoretical aspects of building secure and trustworthy infrastructures. Most recently, she has been working on scalable ledgers, provably secure public key infrastructure and asynchronous coordination and consensus. 

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