miguel pupo correia           

Blockchain and Byzantine Consensus

Byzantine consensus is a problem studied since the later 1970s and Blockchain/cryptocurrencies is arguably its killer application. I have been doing research on Byzantine consensus, state machine replication, intrusion tolerance, and related topics since the early 2000s, often on using trusted components for efficiency, and now I have several ongoing projects on Blockchain.

Current students: Carlos Faria, António Tavares, Paulo Anjos, Tiago Rosado, Jorge Alves, Luís Pereira, Pedro Martins

Software prototypes: RITAS, MinBFT, MinZyzzyna, Spinning, EBAWA

Selected publications:

Giuliana Santos Veronese, Miguel Correia, Alysson Neves Bessani, Lau Cheuk Lung, Paulo Verissimo. Efficient Byzantine Fault Tolerance. IEEE Transactions on Computers, vol. 62, n. 1, pp. 16-30, Jan. 2013 (pdf)

Henrique Moniz, Nuno F. Neves, M. Correia. Byzantine Fault-Tolerant Consensus in Wireless Ad hoc Networks. IEEE Transactions on Mobile Computing, vol. 12, n. 12, Dec. 2013. (pdf)

Miguel Correia, Nuno F. Neves, Paulo Veríssimo. From Consensus to Atomic Broadcast: Time-Free Byzantine-Resistant Protocols without Signatures. Computer Journal. vol. 41, n. 1, pp 82-96, January 2006 (abstract) (pdf)

Miguel Correia, Nuno Ferreira Neves, Lau Cheuk Lung, Paulo Veríssimo. Low Complexity Byzantine-Resilient Consensus. Distributed Computing, vol. 17, n. 3, pp. 237-249, March 2005. (abstract) (pdf)

Paulo Veríssimo and Nuno Ferreira Neves and Miguel Correia. Intrusion-Tolerant Architectures: Concepts and Design. In Architecting Dependable Systems, R. Lemos, C. Gacek, A. Romanovsky (eds.), LNCS 2677, pages 3-36, Springer Verlag, 2003. An extended version is available as DI/FCUL TR03-05 (abstract) (pdf) - A long document introducing the main topics in the area and discussing how to design intrusion-tolerant systems.

Other publications:

A. Bessani, M. Santos, J. Félix, N. F. Neves, M. Correia. On The Efficiency of Durable State Machine Replication. In Proceedings of the USENIX Annual Technical Conference (ATC), 2013 (pdf)

M. Correia, N. F. Neves, P. Verissimo. BFT-TO: Intrusion Tolerance with Less Replicas. Computer Journal, vol. 56, n. 6, pp. 693-715, June 2013. (pdf)

M. Correia, G. S. Veronese, N. F. Neves, P. Verissimo. Byzantine Consensus in Asynchronous Message-Passing Systems: A Survey. International Journal of Critical Computer-Based Systems, vol. 2, n. 2, pp. 141-161, 2011. (pdf)

H. Moniz and N. F. Neves and M. Correia and P. Veríssimo. RITAS: Services for Randomized Intrusion Tolerance. IEEE Transactions on Dependable and Secure Computing, vol. 8, n. 1, pp. 122-136, Jan.-Feb. 2011. (pdf)

Henrique Moniz, Nuno Ferreira Neves, Miguel Correia, Turquois: Byzantine Consensus in Wireless Ad hoc Networks, Proceedings of the International Conference on Dependable Systems and Networks (DSN), Chicago, USA, June 2010. (pdf)

Giuliana Santos Veronese, Miguel Correia, Alysson Neves Bessani, Lau Cheuk Lung. EBAWA: Efficient Byzantine Agreement for Wide-Area Networks. In 12th IEEE International High Assurance Systems Engineering Symposium (HASE). November 2010. (pdf)

Miguel Correia, Giuliana Santos Veronese, Lau Cheuk Lung, Asynchronous Byzantine Consensus with 2f+1 Processes, In Proceedings of the 25th Annual ACM Symposium on Applied Computing, March 2010. (pdf)

Paulo Verissimo, Miguel Correia, Nuno F. Neves, Paulo Sousa. Intrusion-Resilient Middleware Design and Validation. In Information Assurance, Security and Privacy Services, H. Raghav Rao and Shambhu Upadhyaya (eds.), pages 615-678, Emerald, 2009. (pdf)

Miguel Correia, Alysson Neves Bessani, Paulo Verissimo. On Byzantine Generals with Alternative Plans. Journal of Parallel and Distributed Computing, Volume 68, Issue 9, pp 1291-1296, Sep. 2008 (abstract) (pdf)

H. Moniz and N. F. Neves and M. Correia and P. Veríssimo. Experimental Comparison of Local and Shared Coin Randomized Consensus Protocols. In Proceedings of the 27th IEEE Symposium on Reliable Distributed Systems. pages 235-244, Leeds, UK, October 2006 (pdf)

Nuno F. Neves, Miguel Correia, Paulo Veríssimo. Solving Vector Consensus with a Wormhole. IEEE Transactions on Parallel and Distributed Systems, Volume 16,  Issue 12,  Dec. 2005 pp 1120 - 1131 (pdf)

M. Correia and N. F. Neves and P. Veríssimo. How to Tolerate Half Less One Byzantine Nodes in Practical Distributed Systems. In Proceedings of the 23rd IEEE Symposium on Reliable Distributed Systems. Florianopolis, Brasil, pages 174-183, October 2004. (pdf) - The paper in which we show how to implement Byzantine fault-tolerant state machine replication with only 2f+1 replicas (or half less one faulty replicas).

Miguel P. Correia. Serviços Distribuídos Tolerantes a Intrusões: resultados recentes e problemas abertos. V Simpósio Brasileiro em Segurança da Informação e de Sistemas Computacionais - Livro Texto dos Minicursos, pp. 113-162, Sociedade Brasileira de Computação, Setembro de 2005 (pdf) (slides) (versão extendida, also as DI-FCUL tech report) - A book chapter surveying work on intrusion-tolerant distributed services (in portuguese).

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