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Documents authored by Keshav, S.

Found 2 Possible Name Variants:

Keshav, S.

Document
DOI: 10.4230/OASIcs.FAB.2021.4
TimeFabric: Trusted Time for Permissioned Blockchains

Authors: Aritra Mitra, Christian Gorenflo, Lukasz Golab, and S. Keshav

Published in: OASIcs, Volume 92, 4th International Symposium on Foundations and Applications of Blockchain 2021 (FAB 2021)

Abstract
As the popularity of blockchains continues to rise, blockchain platforms must be enhanced to support new application needs. In this paper, we propose one such enhancement that is essential for financial applications and online marketplaces - support for time-based logic such as verifying deadlines or expiry dates and examining a time window of recent account activity. We present a lightweight solution to reach consensus on the current time without relying on external time oracles. Our solution assigns timestamps to blocks at transaction validation time and maintains a cache reflecting the effects of recent transactions. We implement a proof-of-concept prototype, called TimeFabric, in Hyperledger Fabric, a popular permissioned blockchain platform, and experimentally demonstrate high throughput and minimal overhead (approximately 3%) of maintaining trusted time. We also demonstrate a 2x performance improvement due to the cache, compared to reconstructing account histories from the ledger.
Cite as

Aritra Mitra, Christian Gorenflo, Lukasz Golab, and S. Keshav. TimeFabric: Trusted Time for Permissioned Blockchains. In 4th International Symposium on Foundations and Applications of Blockchain 2021 (FAB 2021). Open Access Series in Informatics (OASIcs), Volume 92, pp. 4:1-4:15, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2021)

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@InProceedings{mitra_et_al:OASIcs.FAB.2021.4,
  author =	{Mitra, Aritra and Gorenflo, Christian and Golab, Lukasz and Keshav, S.},
  title =	{{TimeFabric: Trusted Time for Permissioned Blockchains}},
  booktitle =	{4th International Symposium on Foundations and Applications of Blockchain 2021 (FAB 2021)},
  pages =	{4:1--4:15},
  series =	{Open Access Series in Informatics (OASIcs)},
  ISBN =	{978-3-95977-196-2},
  ISSN =	{2190-6807},
  year =	{2021},
  volume =	{92},
  editor =	{Gramoli, Vincent and Sadoghi, Mohammad},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/OASIcs.FAB.2021.4},
  URN =		{urn:nbn:de:0030-drops-139906},
  doi =		{10.4230/OASIcs.FAB.2021.4},
  annote =	{Keywords: Permissioned Blockchain, Timestamp, Clock, Sliding Window, Hyerpleger Fabric}
}

Keshav, Srinivasan

Document
DOI: 10.4230/DagRep.11.6.14
Towards Climate-Friendly Internet Research (Dagstuhl Seminar 21272)

Authors: Vaibhav Bajpai, Oliver Hohlfeld, Jon Crowcroft, and Srinivasan Keshav

Published in: Dagstuhl Reports, Volume 11, Issue 6 (2021)

Abstract
This report presents guidelines for deciding when virtual or hybrid conferences are suitable and how to design them. The report is the output from a Dagstuhl seminar where the goal was to review the current status of virtual conferences and to develop best practices for hybrid conferences. The participants provided input on the state-of-the-art of virtual conferences: what works, what does not, and what needs improvement. From this discussion, the participants discussed the requirements, implications, and guidelines for designing hybrid conferences. The participants felt that in the future, small research meetings will move entirely online whereas larger ones will be held as hybrid events.
Cite as

Vaibhav Bajpai, Oliver Hohlfeld, Jon Crowcroft, and Srinivasan Keshav. Towards Climate-Friendly Internet Research (Dagstuhl Seminar 21272). In Dagstuhl Reports, Volume 11, Issue 6, pp. 14-37, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2021)

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@Article{bajpai_et_al:DagRep.11.6.14,
  author =	{Bajpai, Vaibhav and Hohlfeld, Oliver and Crowcroft, Jon and Keshav, Srinivasan},
  title =	{{Towards Climate-Friendly Internet Research (Dagstuhl Seminar 21272)}},
  pages =	{14--37},
  journal =	{Dagstuhl Reports},
  ISSN =	{2192-5283},
  year =	{2021},
  volume =	{11},
  number =	{6},
  editor =	{Bajpai, Vaibhav and Hohlfeld, Oliver and Crowcroft, Jon and Keshav, Srinivasan},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/DagRep.11.6.14},
  URN =		{urn:nbn:de:0030-drops-155780},
  doi =		{10.4230/DagRep.11.6.14},
  annote =	{Keywords: Carbon Footprint, Energy Efficient Networking, Climate Change}
}
Document
DOI: 10.4230/DagSemProc.05142.3
An Architecture for Tetherless Communication

Authors: Aaditeshwar Seth, Patrick Darragh, Suihong Liang, Yunfeng Lin, and Srinivasan Keshav

Published in: Dagstuhl Seminar Proceedings, Volume 5142, Disruption Tolerant Networking (2005)

Abstract
In the emerging paradigm of tetherless computing, client applications running on small, inexpensive, and smart mobile devices maintain opportunistic wireless connectivity with back-end services running on centralized computers, enabling novel classes of applications. These applications require a communications infrastrastructure that is mobility-aware, disconnection-resilient and provides support for an opportunistic style of communiction. It should even be able to function across network partitions that may arise when end-to-end communication is not possible. We outline, design, and evaluate the implementation of an architecture that provides this functionality. we shot that it is possible for next-generation mobile devices to obtain up to 80-fold improvement over conventional mechanisms by exploiting opportunistic WiFi links, and that this benefit can be delivered as an overlay that is compatible with the current Internet.
Cite as

Aaditeshwar Seth, Patrick Darragh, Suihong Liang, Yunfeng Lin, and Srinivasan Keshav. An Architecture for Tetherless Communication. In Disruption Tolerant Networking. Dagstuhl Seminar Proceedings, Volume 5142, pp. 1-13, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2005)

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@InProceedings{seth_et_al:DagSemProc.05142.3,
  author =	{Seth, Aaditeshwar and Darragh, Patrick and Liang, Suihong and Lin, Yunfeng and Keshav, Srinivasan},
  title =	{{An Architecture for Tetherless Communication}},
  booktitle =	{Disruption Tolerant Networking},
  pages =	{1--13},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2005},
  volume =	{5142},
  editor =	{Marcus Brunner and Lars Eggert and Kevin Fall and J\"{o}rg Ott and Lars Wolf},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/DagSemProc.05142.3},
  URN =		{urn:nbn:de:0030-drops-3519},
  doi =		{10.4230/DagSemProc.05142.3},
  annote =	{Keywords: Delay tolerant networks, Opportunistic communication, Tetherless computing, Wireless, Mobile}
}
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