Blockchain Based Approach for Preserving Car Maintenance History - - PowerPoint PPT Presentation

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Blockchain Based Approach for Preserving Car Maintenance History - - PowerPoint PPT Presentation

Dec 23, 2022 275 likes •718 views

Blockchain Based Approach for Preserving Car Maintenance History Master Project Decentralized and Distributed Systems Lab Iva Najdenova Professor: Bryan Ford Supervisor: Linus Gasser External Supervisor: Alexandru Rusu Overview DEMO

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Blockchain Based Approach for Preserving Car Maintenance History

Iva Najdenova Master Project Supervisor: Linus Gasser External Supervisor: Alexandru Rusu Professor: Bryan Ford Decentralized and Distributed Systems Lab

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Overview

CONCLUSION EXPERIMENTS DEMO IMPLEMENTATION BYZCOIN INTRODUCTION 2

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Overview

CONCLUSION EXPERIMENTS DEMO IMPLEMENTATION BYZCOIN INTRODUCTION 3

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Motivation

  • Fighting frauds in the automotive industry

§ low quality repairs § tampering odometers (mileage) § hiding accidents

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Goal

  • Establish trust between:

§ Car buyers § Car owners § Car dealers § Insurance companies § …

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Overview

CONCLUSION EXPERIMENTS DEMO IMPLEMENTATION BYZCOIN INTRODUCTION 6

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Blockchain Data Structure

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Source: NAKAMOTO, S. Bitcoin: A Peer-to-Peer Electronic Cash System, 2008

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Submitting a Transaction to a Blockchain

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  • 1. Create

Transaction

  • 2. Broadcast
  • 3. Transaction

Verification

  • 4. Block Creation
  • 5. Broadcast
  • 7. Consensus
  • 8. Transaction

Confirmation

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ByzCoin

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Source: https://raw.githubusercontent.com/dedis/cothority/master/byzcoin/ByzCoin.png

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ByzCoinX Consensus Protocol

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Source: https://raw.githubusercontent.com/dedis/cothority/master/byzcoin/ByzCoin.png

  • Collective Signing
  • Absolute Finality
  • Open Membership
  • Tree Structure for Communication

Sharding Authenticate Batch Order Consensus

ByzCoin

Node Node Node

Cothority

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ByzCoin

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Source: https://raw.githubusercontent.com/dedis/cothority/master/byzcoin/ByzCoin.png

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Instructions

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  • Spawn
  • Invoke
  • Delete
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ByzCoin

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Source: https://raw.githubusercontent.com/dedis/cothority/master/byzcoin/ByzCoin.png

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Distributed Access Right Controls

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Source: https://raw.githubusercontent.com/dedis/cothority/master/byzcoin/ByzCoin.png

  • Set of rules
  • Rule – “action” : ”expression with allowed identities”
  • Evolution of Rules
  • Delegating the permissions to another DARC
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Calypso

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Private Data over a Blockchain

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Calypso

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Source: CALYPSO: Auditable Sharing of Private Data over Blockchains, 2018

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Overview

CONCLUSION EXPERIMENTS DEMO IMPLEMENTATION BYZCOIN INTRODUCTION 17

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Implementation

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3" + 2 " - faulty nodes

Insurance Companies

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Business Case

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  • AutoSense IoT Devices
  • Profit – customers of dongle devices
  • AMAG – increased value of cars
  • Insurance Companies – accidents detection in real time
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Use Case Diagram

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DARCs

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Access Control in the System

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DARCs

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Genesis DARC Admin DARC

spawn:darc

  • “_sign” : ”PublicKeyAdmin”
  • “invoke:evolve” : ” PublicKeyAdmin”
  • “spawn:darc” : ” PublicKeyAdmin”
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DARCs

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Admin DARC User DARC

spawn:darc

Car Owner DARC Car Garage DARC Car Reader DARC Car DARC

spawn:darc spawn:darc spawn:darc spawn:darc

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DARCs

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Car DARC

  • “spawn:car” : ”adminDARC”
  • “invoke:car.addReport” : ” carGarageDARC”
  • “spawn:calypsoWrite” : “carGarageDARC”
  • “spawn:calypsoRead” : “carReaderDARC”
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Car Contract

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  • Instructions:

§ spawn : car § invoke : car.addReport

  • Data Structures:

SecretData string Mileage boolean Warranty string RepairNote string Score Report string Date string GarageID []byte WriteInstanceID Car string VIN []Report Reports

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Client Application

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User-Friendly Way of Interaction

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Client Application

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Overview

CONCLUSION EXPERIMENTS DEMO IMPLEMENTATION BYZCOIN INTRODUCTION 28

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DEMO

  • Logs of Conodes
  • User Interface (Desktop Application)
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DEMO

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Overview

CONCLUSION EXPERIMENTS DEMO IMPLEMENTATION BYZCOIN INTRODUCTION 31

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Experiments

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  • Larger Networks and Concurrent Transactions
  • IC Cluster with Mininet Platform:

§ Each Server: 24 cores, 256GB of RAM, 2.5GHz processor

  • Measure:

§ Wall Time § System Cost

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Experiments

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Constant Number of Nodes Variable Number of Concurrent Car Enrollments

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Experiments

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  • Wall Time

§ 5 Nodes, 2 servers § Bandwidth = 100Mbps § Delay = 100ms § Block Interval = 5s

Number of concurrent enrollments / reports

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Experiments

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  • System Cost

§ 5 Nodes, 2 servers § Bandwidth = 100Mbps § Delay = 100ms § Block Interval = 5s

Number of concurrent enrollments / reports

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Experiments

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Constant Number of Concurrent Car Enrollments Variable Number of Nodes

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Experiments

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  • Wall Time

§ 2 servers § Bandwidth = 100Mbps § Delay = 30ms § Block Interval = 5s

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Experiments

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  • System Cost

§ 2 servers § Bandwidth = 100Mbps § Delay = 30ms § Block Interval = 5s

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Overview

CONCLUSION EXPERIMENTS DEMO IMPLEMENTATION BYZCOIN INTRODUCTION 39

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Conclusion

  • Proof of Concept
  • Implementation

§ Car Contract § Access Control § Calypso Interaction § Java Desktop Application

  • Experiments
  • Future Work

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Thank You for Your Attention!

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Overview

CONCLUSION EXPERIMENTS DEMO IMPLEMENTATION BYZCOIN INTRODUCTION 42