1. SDP 11 PDR Team Goeckel Group: Adebayo Adeyemi, Joseph Hayward, Mark Kohls, Simon McAuliffe Advisor: Dennis Goeckel PDR Keeping The Secret

2. 2 SDP 11 PDR Team Goeckel What is encryption?

3. 3 SDP 11 PDR Team Goeckel So, What’s wrong with it?  Encrypted transmissions can be recorded  These recording can be broken  Information can be sensitive for years  Computers are getting faster and faster

4. 4 SDP 11 PDR Team Goeckel Applications  Military Out in the field Missions only last less than 12 hours Sensitive can be transmitted Many people out in the field No knowledge of where the enemy may be  Commercial Keep people from recording inside building Keep signal from being recorded from outside building

5. 5 SDP 11 PDR Team Goeckel Competitors  Direct link  Trunked radio system  Frequency hopping spread spectrum.

6. 6 SDP 11 PDR Team Goeckel Direct Link Marine tactical data system. Large Directed Antenna Heavy, Expensive

7. 7 SDP 11 PDR Team Goeckel Trunked System Pre-known shared key needed Easily recorded with a spectrum analyzer Even UMASS has one

8. 8 SDP 11 PDR Team Goeckel Frequency Hopping A pre-known shared key for communication The security can be easily broken

9. 9 SDP 11 PDR Team Goeckel System Requirements  Battery life of at least 12 hours  Receive and transmit  Operate while walking  Operate up to 300 meters. Receive signal with 95% success rate.  Voice Transmission Bandwidth  Maintain secure communications Less than 10% interception rate  Handheld and less than 2lbs.

10. 10 SDP 11 PDR Team Goeckel Proposed Solution Step 1: Send test signal to desired radio.

11. 11 SDP 11 PDR Team Goeckel Proposed Solution Step 2: RX radio sends back reply signal. Friends measure this signal strength.

12. 12 SDP 11 PDR Team Goeckel Proposed Solution Step 3: TX radio sends out message. Friends not in range transmit noise.

13. 13 SDP 11 PDR Team Goeckel Hardware Requirements  Receiver with Signal Strength Indicator  Transmitter without interference filtering  Battery Power  300 meter Range  Narrow band FM

14. 14 SDP 11 PDR Team Goeckel Radio Diagram Antenna Receiver Transmitter Microcontroller Microphone Speaker Transceiver

15. 15 SDP 11 PDR Team Goeckel Radio Choice Linx Technologies HP3 RF Solutions T5/R5 434 Radiometrix BiM3A Received Signal Strength Indicator No Interference Filtering Fully Integrated Programmable Battery Power Frequency Band (MHz) 900-928433900-928 Range (m) 300 200 Choice: Linx Technologies HP3

16. 16 SDP 11 PDR Team Goeckel Software Requirements RX Radio TX Radio

17. 17 SDP 11 PDR Team Goeckel Design Challenges  Noise Appropriate Signal Threshold Duration for transmission  Variable transmission strength  Making overall system compact SMD vs. Through Hole components  Demonstrate functioning system Computer display of radio activity

18. 18 SDP 11 PDR Team Goeckel MDR Deliverable The goal for MDR will be to demonstrate measurement of receive signal and transmitting noise. Step 1: Send test signal to desired radio.

19. 19 SDP 11 PDR Team Goeckel MDR Deliverable The goal for MDR will be to demonstrate measurement of receive signal and transmitting noise. Step 2: RX radio sends back reply signal. Friends measure this signal strength.

20. 20 SDP 11 PDR Team Goeckel MDR Deliverable The goal for MDR will be to demonstrate measurement of receive signal and transmitting noise. Step 3: TX radio sends out message. Friends not in range transmit noise.

21. 21 SDP 11 PDR Team Goeckel Questions?