1. Team Wolf Distributed, Consistent and Secure USB Hub Sean Busch Matt Dube Eddie Lai Zhou Zheng

2. Team Wolf 2 Backing Up Data  Everyone needs to save their work and data This data needs to be available in multiple locations Data needs to be readily available Today’s most popular storage device is the thumb drive  Backups have problems Can be physically broken Need to be carried around Can wear out after a number of reads/writes  This leads to using multiple backups

3. Team Wolf 3 Multiple Backups  Multiple backups create problems Data changes create inconsistencies between backups When many backups are created, data becomes vulnerable  The solution: Distributed Consistent Secure USB Hub Maintains consistency − Spatial separation − Temporal separation Ensures data security − Secret sharing − Secure connections

4. Team Wolf 4 System Architecture

5. Team Wolf 5 Outline  Introduction  System Architecture  Usage Scenarios  Requirements  Proposed Design  MDR Deliverables

6. Team Wolf 6 Usage Scenarios  Initialization  Spatial Separation  Temporal Separation  Secret Sharing

7. Team Wolf 7 Scenario 0: Initialization  Authenticates each Hub and USB drive

8. Team Wolf 8 Scenario 1: Spatial Separation  Hub keeps backups consistent even if they are in different locations

9. Team Wolf 9 Scenario 2: Temporal Separation  Unconnected drives updated when plugged into Hub Later

10. Team Wolf 10 Scenario 3: Secret Sharing  Keep backups confidential

11. Team Wolf 11 Software  Consistency Utilize concepts from current versioning systems If modifications are made, distribute changes If not all devices are connected save modifications on each Hub − Synchronize remaining backups and delete modifications from Hub  Security (k, n) threshold scheme Requires a subset, k, of a set, n, to recover data With fewer than k pieces, no information about the data can be recovered

12. Team Wolf 12 Requirements  Powerful embedded system Processor  Cost: Maximum $200  Low Power Consumption: <= 20W  Network capability  I/O ports Minimum 4 USB ports per hub Interface with computer via USB  Minimum 64 GB storage on Hub Support 16 GB USB sticks  Must run Operating System Will not require external software installation

13. Team Wolf 13 Block Diagram

14. Team Wolf 14 Prototype System  Atom Prototype Board Atom D510 1.66 GHz 2 GB DDR2@ 667 MHz 160 GB SATA HD Network Connectivity 4 USB Ports Linux OS Dimensions 17cm x 17cm Max 20 W

15. Team Wolf 15 Optional Custom PCB  Prototype contains unnecessary features  Advantages Slim Design Less Power Consumption Shrink Size by 35 %  Disadvantages Expensive Potential of Not Working

16. Team Wolf 16 MDR Deliverables  2 hubs based on Advantech Intel Atom board Initialize (Scenario 0) − Authenticate hubs to each other − Authenticate USBs to hub-network Make backup and distribute (Scenario 1) Distribute updates to non-connected USB sticks (Scenario 2)

17. Team Wolf 17 Questions?