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Distributed, Consistent and Secure USB Storage Midyear Design Review Eddie Lai Matt Dube Sean Busch Zhou Zheng Team Wolf Outline PDR Summary Design Implementation Proposed MDR Deliverables Demonstration CDR Deliverables Team Wolf 2 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 Team Wolf 3 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 Team Wolf 4 Project Design Implementation Parts to be implemented • Custom Software • Network Interface • PC interface Rest provided by Atom development board Team Wolf 5 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 Team Wolf 6 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 Team Wolf 7 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 Team Wolf 8 PC Interface Solutions Bridge cable • Cable with USB A at each end • Embedded system in-between • Enables PC to PC file transfer I2C 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 Team Wolf 9 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 Team Wolf 10 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 Team Wolf 11 Demonstration Team Wolf 12 Performance Data Team Wolf 13 Performance Data Team Wolf 14 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 Team Wolf 15 Questions Team Wolf 16