NavTalks

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<h2><strong>September 2018</strong></h2>
<h2><strong>September 2018</strong></h2>
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             <td style="width:100px">20 September</td>
             <td style="width:100px">20 September</td>
             <td style="width:200px">Alysson Bessani</td>  
             <td style="width:200px">Alysson Bessani</td>  
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             <td style="width:500px"><span style="border-bottom: dashed 1px #000" title="The blockchain has emerged as a disruptive paradigm to build decentralized transactional applications such as cryptocurrencies. The core of the technology is the consensus algorithm used to order blocks of transactions in a Byzantine fault-tolerant (BFT) way. There are two basic classes of such algorithms: Nakamoto consensus (employed in Bitcoin and other permissionless systems), which requires peers to solve a cryptographic puzzle to propose new blocks and eventually converge to a single chain; and “traditional” BFT consensus (used in permissioned systems), which employs well-known protocols for reaching agreement in a closed set of known processes. The former scales to 10000s of nodes but can process only a few transactions/s with a latency of hours, while the latter performs much better, but only with a few dozens of nodes. Recently, many hybrid consensus protocols have been proposed. They merge these two classes to achieve both scalability and performance. Although promising, they are still subject to limitations coming from their building blocks (e.g., high latency and power consumption). SMaRtChain aims to devise a set of radically different consensus protocols for both permissioned and permissionless blockchains. First, we plan to extend the Consensus with Unknown Participants paradigm to adapt it for open blockchains, aiming to overcome the limitations described above. Second, we want to design new scalable and high-performance BFT consensus algorithms based on solid theoretical building blocks for 1000s of nodes (enough for hybrid and permissioned blockchains) and capable of processing 1000s of transactions/s with sub-second latency. We will implement and integrate these contributions into existing open-source blockchain platforms (e.g., Fabric, Corda) for maximum impact. Finally, we will investigate and address the limitations of existing blockchains to support applications requiring big data, machine learning, and integration with the internet of things.">
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             <td style="width:600px"><span style="border-bottom: dashed 1px #000" title="The blockchain has emerged as a disruptive paradigm to build decentralized transactional applications such as cryptocurrencies. The core of the technology is the consensus algorithm used to order blocks of transactions in a Byzantine fault-tolerant (BFT) way. There are two basic classes of such algorithms: Nakamoto consensus (employed in Bitcoin and other permissionless systems), which requires peers to solve a cryptographic puzzle to propose new blocks and eventually converge to a single chain; and “traditional” BFT consensus (used in permissioned systems), which employs well-known protocols for reaching agreement in a closed set of known processes. The former scales to 10000s of nodes but can process only a few transactions/s with a latency of hours, while the latter performs much better, but only with a few dozens of nodes. Recently, many hybrid consensus protocols have been proposed. They merge these two classes to achieve both scalability and performance. Although promising, they are still subject to limitations coming from their building blocks (e.g., high latency and power consumption). SMaRtChain aims to devise a set of radically different consensus protocols for both permissioned and permissionless blockchains. First, we plan to extend the Consensus with Unknown Participants paradigm to adapt it for open blockchains, aiming to overcome the limitations described above. Second, we want to design new scalable and high-performance BFT consensus algorithms based on solid theoretical building blocks for 1000s of nodes (enough for hybrid and permissioned blockchains) and capable of processing 1000s of transactions/s with sub-second latency. We will implement and integrate these contributions into existing open-source blockchain platforms (e.g., Fabric, Corda) for maximum impact. Finally, we will investigate and address the limitations of existing blockchains to support applications requiring big data, machine learning, and integration with the internet of things.">
SMaRtChain: A Principled Design for a New Generation of Blockchains</span></td>  
SMaRtChain: A Principled Design for a New Generation of Blockchains</span></td>  
             <td style="width:30px">&nbsp;</td>
             <td style="width:30px">&nbsp;</td>

Revision as of 11:35, 13 November 2018

The Navtalks is a series of informal talks given by Navigators members or some special guests about every two-weeks at Ciências, ULisboa.

Leave mouse over title's presentation to read the abstract.

Contents

September 2018

20 September Alysson Bessani SMaRtChain: A Principled Design for a New Generation of Blockchains  
20 September Rui Miguel Named Data Networking with Programmable Switches  

October 2018

4 October Bruno Vavala (Research Scientist in Intel Labs) Private Data Objects  
4 October Marcus Völp (Research Scientist, CritiX, SnT, Univ. of Luxembourg) Reflective Consensus  
18 October Yair Amir (Professor, Johns Hopkins University) Timely, Reliable, and Cost-Effective Internet Transport Service using Structured Overlay Networks  

November 2018

13/11 Salvatore Signorello The Past, the Present and some Future of Interest Flooding Attacks in Named-Data Networking  
13/11 Tiago Oliveira Vawlt - Privacy-Centered Cloud Storage  

November 2018

27/11 Nuno Neves    
27/11 Ricardo Mendes    

December 2018

11/12 António Casimiro    
11/12Carlos Nascimento      

January 2019

15/01 Fernando Alves    
15/01 Ibéria Medeiros    
29/01 Fernando Ramos    
29/01 Miguel Garcia    

February 2019

19/02 Ana Fidalgo    
19/02 João Sousa    

March 2019

12/03 Pedro Gaspar    
12/03 Ricardo Morgado    
26/03 André Oliveira    
26/03 Nuno Dionísio    

April 2019

09/04 Adriano Serckumecka    
09/04 Tulio Ribeiro    
30/04 Miguel Moreira    
30/04 Pedro Ferreira    

May 2019

14/05 Diogo Gonçalves    
14/05 Vinicius Cogo    
28/05 Francisco Araújo    
28/05 Miguel Matos    

June 2019

11/06 Eric Vial    
11/06 Robin Vassantlal    
25/06 João Pinto    
25/06 Tiago Correia    
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