Midway Design Review

HDDLock

Department of Electrical & Computer Engineering

Advisor:Professor Michael Zink

Team:Brigit Lyons

Fadi MaalouliTony PanettaRenzo Silva

Midway Design Review

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Outline

• Design overview and modifications• MDR goal reminder• Progress of each component• Demo • Division of labor• Prototype Cost• CDR goals

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Website

Account Database

Bluetooth Module Processor (AIRCable SMD) (Intel Atom)

Old Design

Security Device

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Problems with Old Design

• Reliant on Internet/3G connection• Problems with AIRCable SMD Bluetooth

module• Intel Atom Processor very complex to work

with

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Bluetooth Module Microcontroller(Roving Network (GHI EMX) RN-41)

New Design

Security Device

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Solution

• No need for a database/website to get encryption key

• Roving Network RN-41 Bluetooth module is easy to use and has a high success rate

• GHI EMX development system simple to interface with

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MDR Goals

Working encryption algorithm• Hardware and software algorithms evaluated

Basic Bluetooth communication• RN-41 Module communication

Basic phone application• Basic communication with RN-41

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Current Project Status

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C AES Performance

0 2000 4000 6000 8000 10000 120000

0.005

0.01

0.015

0.02

0.025

0.03C Algorithm Encryption SpeedSpeed (Gb/s)

Number of Runs

0 2000 4000 6000 8000 10000 120000

0.0010.0020.0030.0040.0050.006

C Algorithm Decryption Speed

Number of Runs

Speed (Gb/s)

* Speed (Gb/s) = (128*Number of Runs)/(Runtime*109)**Tests performed on a 2.66GHz machine***Speeds calculated based on code execution time. On a multitasking system, this includes both idle time and processor time.

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Verilog AES Performance

Decryption: 13 clock cycles per 128-bit decrypt (red) + one-time 13 cycle key expansion each time encryption key is changed (blue)

Encryption: 13 clock cycles per 128-bit encryption (red) [key expansion can be done in parallel here]

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Comparison of Performance• Encryption:

• C: 0.025Gb/s at 2.66GHz • Number of clock cycles per encryption run = (128/Speed(Gb/s))*CPU Clock Speed• With a 2.66Ghz at 0.025Gb/s -> 13,620 clocks cycles per encryption run• Assuming 1% of runtime spent on processor -> 136 CPU cycles per run

• Verilog: 13clock cycles• Verilog performs (136/13) ≈ 10x faster

• Decryption• C: 0.005Gb/s at 2.66GHz

• Number of clock cycles per decryption run = (128/Speed(Gb/s))*CPU Clock Speed• With a 2.66Ghz at 0.025Gb/s -> 68,096 clocks cycles per encryption run• Assuming 1% of runtime spent on processor -> 681 CPU cycles per run

• Verilog: 13clock cycles• Verilog performs (681/13) ≈ 52x faster

• The assumption that 1% of C code runtime is spent on the processor is used to offset the fact that on a multitasking system, the total runtime includes both processor and idle cycles.

Department of Electrical & Computer Engineering

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Power Control

Power Supply

Voltage Regulator

(5v to 3.3V)

RN-41 Bluetooth

5VSwitch

Power Control (PIO 7 and 8) 3.1V – 800mA

3.3V Input

5V 12V

5V – 3A

12V – 3A (peak current)12VSwitch(30W max)

3.1v Switch

Gnd Gnd

500nF Cap

100k R

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Bluetooth

• Voltage (DC) Min 3.0 Typ 3.3 Max 3.6

• Average Power Consumption when Connected (normal mode) 30mW

• Output logic level HIGH VDD-0.2V • The RN41 delivers up to 3 Mbps data

rate for distances to 100M.

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Android Application

• Development and testing environment• Android SDK plug-in for Eclipse IDE on Win 7• Testing on Motorola Droid and HTC EVO handsets

• Application built off of open source BlueTerm• Fundamentals for programming/communicating

with RN-41 via Bluetooth• Additional functionality will be easy to integrate

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Demo

1. Open Application2. Bring up Options Menu3. Select “Connect device”4. Scan for HDDlock if not shown in device list5. Select HDDlock from device list6. Enter pairing code ‘1234’ if not already paired7. Send commands to RN-41 to enter command

mode, set pin as output, and set pin high8. Disconnect

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Roles and Management• Brigit (CSE): Set up Android development/testing environment

and worked on the Android Application• Administrative: Webmaster

• Fadi (EE): Worked on enabling/configuring Bluetooth module• Administrative: Scheduling

• Tony (CSE): Worked on encryption algorithms in C and Verilog• Administrative: Documentation

• Renzo (EE): Designed power management between RN-41 and hard drive, and worked on the Android Application• Administrative: Purchase Orders

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Current and Projected Costs

• Prototype Cost: $291.4 • 80GB Hard Drive: $35.99• Cables: $17.92• High power MOSFETs: $2.98• RN-41: $59.95• GHI EMX Development System: $125 • PCB Fabrication: $50

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CDR Goals

• Android Application:• User login/authentication• Send encryption key to security device

• Security Device:• Communication between development board and

Bluetooth module• Encryption algorithm working on development

board• Research OS libraries for read/write from hard drive

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Questions?