George Bissias

I am currently research faculty at the College of Information and Computer Science at the University of Massachusetts at Amherst working with Professor Brian Levine. I completed my PhD at UMass in 2010.

My interests include large scale data processing and analysis, design and maintenance of distributed databases, and security and scalability for cryptocurrencies.

• [PDF] Deploying Fair and Efficient Course Allocation Mechanisms, by Paula Navarrete Díaz, Cyrus Cousins, George Bissias, Yair Zick. Workshop on Incentives in Academia, July 2024.

• [PDF] Tailstorm: A Secure and Fair Blockchain for Cash Transactions, by Patrik Keller, Ben Glickenhaus, George Bissias, Gregory Griffith. 5th Conference on Advances in Financial Technologies (AFT), October 2023.

• [PDF] Pricing Security in Proof-of-Work Systems, by George Bissias, Rainer Böhme, David Thibodeau, Brian Levine. Workshop on the Economics of Information Security (WEIS), June 2022.

• [PDF] Radium: Improving Dynamic PoW Targeting, by George Bissias. ESORICS International Workshop on Cryptocurrencies and Blockchain Technology , September 2020.

• [PDF] Bobtail: Improved Blockchain Security with Low-Variance Mining, by George Bissias and Brian Levine. ISOC Network and Distributed System Security Symposium , February 2020.

• [PDF] Bonded Mining: Difficulty Adjustment by Miner Commitment, by George Bissias, David Thibodeau, and Brian Levine. ESORICS International Workshop on Cryptocurrencies and Blockchain Technology, September 2019.

• [PDF] Greedy but Cautious: Conditions for Miner Convergence to Resource Allocation Equilibrium, by George Bissias, Brian Levine, and David Thibodeau. arXiv preprint arXiv:1907.09883, August 2019.

• [PDF] PSynDB: Accurate and Accessible Private Data Generation, by Zhiqi Huang, Ryan McKenna, George Bissias, Gerome Miklau, Michael Hay, Ashwin Machanavajjhala. Proceedings of the VLDB Endowment (demo), August 2019.

• [PDF] Ektelo: A Framework for Defining Differentially-Private Computations, by Dan Zhang, Ryan Mckenna, Ios Kotsogiannis, George Bissias, Michael Hay, Ashwin Machanavajjhala, Gerome Miklau. ACM SIGMOD Record, July 2019.

• [PDF] Graphene: Efficient Interactive Set Reconciliation Applied to Blockchain Propagation, by A. Pinar Ozisik, Brian N. Levine, George Bissias, Gavin Andresen, Darren Tapp, and Sunny Katkuri. ACM SIGCOMM, August 2019.

• [PDF] An Algorithm for Bounding the Probability of r-core Formation in k-uniform Random Hypergraphs, by George Bissias. arXiv preprint arXiv:1901.04934, January 2019.

• [PDF] Using Economic Risk to Model Miner Hash Rate Allocation in Cryptocurrencies, by George Bissias, Brian Levine, and David Thibodeau. ESORICS International Workshop on Cryptocurrencies and Blockchain Technology, September 2018.

• [PDF] Market-based Security for Distributed Applications, by George Bissias, Brian Levine, and Nikunj Kapadia. In Proceedings of the 2017 ACM Workshop on New Security Paradigms, September 2017.

• [PDF] Graphene: A New Protocol for Block Propagation Using Set Reconciliation, by A. Pinar Ozisik, Gavin Andresen, George Bissias, Amir Houmansadr, and Brian Levine. International Workshop on Cryptocurrencies and Blockchain Technology, September 2017.

• [PDF] Estimation of Miner Hash Rates and Consensus on Blockchains, by A. Pinar Ozisik, George Bissias, and Brian Levine. arXiv preprint arXiv:1707.00082, July 2017.

• [PDF] An Analysis of Attacks on Blockchain Consensus, by George Bissias, Brian Levine, A. Pinar Ozisik, Gavin Andresen, and Amir Houmansadr. arXiv preprint arXiv:1610.07985, October 2016.

• [PDF] Exploring Privacy-Accuracy Tradeoffs using DPComp, Michael Hay, Ashwin Machanavajjhala, Gerome Miklau, Yan Chen, Dan Zhang, and George Bissias. In Proceedings of the 2016 ACM Conference on Management of Data, June 2016.

• [PDF] A Secure, Efficient, and Transparent Network Architecture for Bitcoin, by A. Pinar Ozisik, Gavin Andresen, George Bissias, Amir Houmansadr, and Brian Levine. University of Massachusetts Amherst Tech Report UM-CS-2016-006, October 2016.

• [PDF] Forensic Identification of Anonymous Sources in OneSwarm, by George Bissias, Brian Levine, Marc Liberatore, and Swagatika Prusty. IEEE Transactions on Dependable and Secure Computing, November 2015.

• [PDF] Sybil-Resistant Mixing for Bitcoin, by George Bissias, A. Pinar Ozisik, Brian N. Levine, and Marc Liberatore. In Proceedings of ACM Workshop on Privacy in the Electronic Society (WPES), November 2014.

• [PDF] Assessing the Vulnerability of Replicated Network Services, by George Dean Bissias, Brian Neil Levine, and Ramesh Sitaraman. Conference on emerging Networking EXperiments and Technologies , November 2010.

• [PDF] Frequency-Based Relay Placement in Mobile Networks, by George Dean Bissias, Brian Neil Levine, and Ramesh Sitaraman. Technical Report UM-CS-2009-045, 2009.

• [PDF] Surviving Attacks on Disruption-Tolerant Networks without Authentication, by John Burgess, George Dean Bissias, Mark Corner, and Brian Neil Levine. International Symposium on Mobile Ad Hoc Networking and Computing, September 2007.

• [PDF] Bounding Damage From Link Destruction with Application to the Internet (extended abstract), by George Dean Bissias, Brian Neil Levine, and Arnold Rosenberg. In Proceedings of ACM SIGMETRICS, June 2007.

• [PDF] Privacy Vulnerabilities in Encrypted HTTP Streams, by George Dean Bissias, Marc Liberatore, David Jensen, and Brian Neil Levine. In Proceedings of Privacy Enhancing Technologies Workshop (PET), May 2005.