article published yes Eleftherios Kokoris Kogias author f5983044-d7ef-11ea-ac6d-fd1430a26d30 Enis Ceyhun Alp author Linus Gasser author Philipp Jovanovic author Ewa Syta author Bryan Ford author ElKo department 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. This work enhances 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: (a) enabling the auditable management of secrets and (b) 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. https://creativecommons.org/licenses/by-nc-nd/4.0/ Association for Computing Machinery2020 eng 2150-8097 00065849540001210.14778/3436905.3436917 144586-599 Kokoris Kogias, E., Alp, E. C., Gasser, L., Jovanovic, P., Syta, E., &#38; Ford, B. (2020). CALYPSO: Private data management for decentralized ledgers. <i>Proceedings of the VLDB Endowment</i>. Association for Computing Machinery. <a href="https://doi.org/10.14778/3436905.3436917">https://doi.org/10.14778/3436905.3436917</a> Kokoris Kogias E, Alp EC, Gasser L, Jovanovic P, Syta E, Ford B. 2020. CALYPSO: Private data management for decentralized ledgers. Proceedings of the VLDB Endowment. 14(4), 586–599. Kokoris Kogias, Eleftherios, et al. “CALYPSO: Private Data Management for Decentralized Ledgers.” <i>Proceedings of the VLDB Endowment</i>, vol. 14, no. 4, Association for Computing Machinery, 2020, pp. 586–99, doi:<a href="https://doi.org/10.14778/3436905.3436917">10.14778/3436905.3436917</a>. E. Kokoris Kogias, E. C. Alp, L. Gasser, P. Jovanovic, E. Syta, and B. Ford, “CALYPSO: Private data management for decentralized ledgers,” <i>Proceedings of the VLDB Endowment</i>, vol. 14, no. 4. Association for Computing Machinery, pp. 586–599, 2020. Kokoris Kogias, Eleftherios, Enis Ceyhun Alp, Linus Gasser, Philipp Jovanovic, Ewa Syta, and Bryan Ford. “CALYPSO: Private Data Management for Decentralized Ledgers.” <i>Proceedings of the VLDB Endowment</i>. Association for Computing Machinery, 2020. <a href="https://doi.org/10.14778/3436905.3436917">https://doi.org/10.14778/3436905.3436917</a>. Kokoris Kogias E, Alp EC, Gasser L, Jovanovic P, Syta E, Ford B. CALYPSO: Private data management for decentralized ledgers. <i>Proceedings of the VLDB Endowment</i>. 2020;14(4):586-599. doi:<a href="https://doi.org/10.14778/3436905.3436917">10.14778/3436905.3436917</a> E. Kokoris Kogias, E.C. Alp, L. Gasser, P. Jovanovic, E. Syta, B. Ford, Proceedings of the VLDB Endowment 14 (2020) 586–599. 90112021-01-17T23:01:13Z2024-10-09T21:00:32Z