2 Search Results for "Kapitza, Rüdiger"

Document
DOI: 10.4230/LIPIcs.OPODIS.2018.15
Hybrid Fault-Tolerant Consensus in Asynchronous and Wireless Embedded Systems

Authors: Wenbo Xu, Signe Rüsch, Bijun Li, and Rüdiger Kapitza

Published in: LIPIcs, Volume 125, 22nd International Conference on Principles of Distributed Systems (OPODIS 2018)

Abstract
Byzantine fault-tolerant (BFT) consensus in an asynchronous system can only tolerate up to floor[(n-1)/3] faulty processes in a group of n processes. This is quite a strict limit in certain application scenarios, for example a group consisting of only 3 processes. In order to break through this limit, we can leverage a hybrid fault model, in which a subset of the system is enhanced and cannot be arbitrarily faulty except for crashing. Based on this model, we propose a randomized binary consensus algorithm that executes in complete asynchrony, rather than in partial synchrony required by deterministic algorithms. It can tolerate up to floor[(n-1)/2] Byzantine faulty processes as long as the trusted subsystem in each process is not compromised, and terminates with a probability of one. The algorithm is resilient against a strong adversary, i. e. the adversary is able to inspect the state of the whole system, manipulate the delay of every message and process, and then adjust its faulty behaviour during execution. From a practical point of view, the algorithm is lightweight and has little dependency on lower level protocols or communication primitives. We evaluate the algorithm and the results show that it performs promisingly in a testbed consisting of up to 10 embedded devices connected via an ad hoc wireless network.
Cite as

Wenbo Xu, Signe Rüsch, Bijun Li, and Rüdiger Kapitza. Hybrid Fault-Tolerant Consensus in Asynchronous and Wireless Embedded Systems. In 22nd International Conference on Principles of Distributed Systems (OPODIS 2018). Leibniz International Proceedings in Informatics (LIPIcs), Volume 125, pp. 15:1-15:16, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019)

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@InProceedings{xu_et_al:LIPIcs.OPODIS.2018.15,
  author =	{Xu, Wenbo and R\"{u}sch, Signe and Li, Bijun and Kapitza, R\"{u}diger},
  title =	{{Hybrid Fault-Tolerant Consensus in Asynchronous and Wireless Embedded Systems}},
  booktitle =	{22nd International Conference on Principles of Distributed Systems (OPODIS 2018)},
  pages =	{15:1--15:16},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-098-9},
  ISSN =	{1868-8969},
  year =	{2019},
  volume =	{125},
  editor =	{Cao, Jiannong and Ellen, Faith and Rodrigues, Luis and Ferreira, Bernardo},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.OPODIS.2018.15},
  URN =		{urn:nbn:de:0030-drops-100757},
  doi =		{10.4230/LIPIcs.OPODIS.2018.15},
  annote =	{Keywords: Distributed system, consensus, fault tolerance}
}
Document
DOI: 10.4230/DagRep.2.7.56
Security and Dependability for Federated Cloud Platforms (Dagstuhl Seminar 12281)

Authors: Rüdiger Kapitza, Matthias Schunter, Marc Shapiro, Paulo Verissimo, and Michael Waidner

Published in: Dagstuhl Reports, Volume 2, Issue 7 (2013)

Abstract
From July 8-13, 2012, the Dagstuhl Seminar "Security and Dependability for Federated Cloud Platforms" was held in Schloss Dagstuhl -- Leibniz Center for Informatics. During this seminar, participants presented their current research and discussed open problems in the fields of security and dependability of infrastructure clouds and their federation. The executive summary and abstracts of the talks given during the seminar are put together in this paper.
Cite as

Rüdiger Kapitza, Matthias Schunter, Marc Shapiro, Paulo Verissimo, and Michael Waidner. Security and Dependability for Federated Cloud Platforms (Dagstuhl Seminar 12281). In Dagstuhl Reports, Volume 2, Issue 7, pp. 56-72, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2012)

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@Article{kapitza_et_al:DagRep.2.7.56,
  author =	{Kapitza, R\"{u}diger and Schunter, Matthias and Shapiro, Marc and Verissimo, Paulo and Waidner, Michael},
  title =	{{Security and Dependability for Federated Cloud Platforms (Dagstuhl Seminar 12281)}},
  pages =	{56--72},
  journal =	{Dagstuhl Reports},
  ISSN =	{2192-5283},
  year =	{2012},
  volume =	{2},
  number =	{7},
  editor =	{Kapitza, R\"{u}diger and Schunter, Matthias and Shapiro, Marc and Verissimo, Paulo and Waidner, Michael},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/DagRep.2.7.56},
  URN =		{urn:nbn:de:0030-drops-37352},
  doi =		{10.4230/DagRep.2.7.56},
  annote =	{Keywords: Security, Cloud computing, Virtual systems, Dependability, Grid computing, Systems management}
}
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