1. Team Wolf Distributed, Consistent and Secure USB Storage Midyear Design Review Eddie Lai Matt Dube Sean Busch Zhou Zheng

2. Team Wolf 2 Outline  PDR Summary  Design Implementation  Proposed MDR Deliverables  Demonstration  CDR Deliverables

3. Team Wolf 3 Project Summary  A device that distributes backups across several USB drives  Maintains consistency as long as the backups are conflict free  Distributes backups to devices interfaced across a network  Requires minimal user input

4. Team Wolf 4 Secure Application  (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

5. Team Wolf 5 Project Design Implementation  Parts to be implemented Custom Software Network Interface PC interface  Rest provided by Atom development board

6. Team Wolf 6 Custom Software  Sending hub Save listing of checksum, timestamps, and folder paths at one time Save listing at a later time and “diff” the two records Process changes and send to other hubs  Receiving hub Record the “USB Network” from the received update Iterate through each USB to check if they belong to the USB Network Distribute updates

7. Team Wolf 7 Network Interface  TCP/IP socket connection over a LAN Unsecure  Client/server model Server – wait for connection from client with update messages Client – connect to server, send update messages, then disconnect

8. Team Wolf 8 PC Interface  Hub should appear as a USB mass storage device Hub must act as a USB device (slave) to PC (master)  Developing this interface has been a significant challenge USB protocol deliberately very uneven − Most of the software and hardware located on host side − Not meant for PC to PC (host to host) data transfer Atom development board only contains USB host ports − Would require additional hardware and drivers

9. Team Wolf 9 PC Interface Solutions  Bridge cable Cable with USB A at each end Embedded system in-between Enables PC to PC file transfer  I 2 C USB slave adapter Philips ISP1301 USB OTG Would allow the Atom to interface with USB physical layer Requires additional hardware and overhead  Different embedded system Beagle Board

10. Team Wolf 10 Beagle Board  Low power, low cost system on chip  Slight reduction in performance vs Atom ARM ® Cortex TM -A8 MHz at 1 GHz 512MB of low-power DDR RAM  Tiny 3.25" × 3.25" footprint  4 USB hosts and 1 USB OTG 2.0 port OTG port allows board to act as USB device Would handle same number of USB drives as atom board $149.99 price point

11. Team Wolf 11 Proposed MDR Deliverables  2 hubs based on Advantech Intel Atom board  Initialize and authenticate hubs to each other − Authenticate USBs to hub-network  Detect and distribute updates

12. Team Wolf 12 Demonstration

13. Team Wolf 13 Performance Data

14. Team Wolf 14 Performance Data

15. Team Wolf 15 Proposed CDR Deliverables  PC interface Hub will appear to user’s PC as single USB Mass Storage Device  Secure socket connections  User interface for initializing and configuring the system User should be able to use web browser to access interface  Physical user interaction with hub Buttons to initiate sync and ejections LEDs to indicate sync in progress and when its ok to eject

16. Team Wolf 16 Questions