pdr keeping the secret
DESCRIPTION
PDR Keeping The Secret . Group: Adebayo Adeyemi, Joseph Hayward, Mark Kohls, Simon McAuliffe Advisor: Dennis Goeckel. What is encryption?. So, What’s wrong with it?. Encrypted transmissions can be recorded These recording can be broken Information can be sensitive for years - PowerPoint PPT PresentationTRANSCRIPT
SDP 11 PDR Team Goeckel
Group: Adebayo Adeyemi, Joseph Hayward, Mark Kohls, Simon McAuliffe
Advisor:Dennis Goeckel
PDRKeeping The Secret
2SDP 11 PDR Team Goeckel
What is encryption?
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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
4SDP 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
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Competitors Direct link Trunked radio system Frequency hopping spread spectrum.
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Direct Link
Marine tactical data system.
Large Directed Antenna Heavy, Expensive
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Trunked SystemPre-known shared key needed
Easily recorded with a spectrum analyzer
Even UMASS has one
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Frequency Hopping
A pre-known shared key for communicationThe security can be easily broken
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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.
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Proposed Solution
Step 1: Send test signal to desired
radio.
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Proposed Solution
Step 2: RX radio sends back reply signal. Friends measure this
signal strength.
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Proposed Solution
Step 3: TX radio sends out
message. Friends not in range
transmit noise.
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Hardware Requirements Receiver with Signal Strength Indicator Transmitter without interference filtering Battery Power 300 meter Range Narrow band FM
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Radio Diagram
Antenna
Receiver
Transmitter
Microcontroller
Microphone
Speaker
Transceiver
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Radio ChoiceLinx Technologies HP3
RF Solutions T5/R5 434
Radiometrix BiM3A
Received Signal Strength IndicatorNo Interference FilteringFully IntegratedProgrammableBattery PowerFrequency Band (MHz) 900-928 433 900-928
Range (m) 300 300 200
Choice: Linx Technologies HP3
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Software Requirements
RX Radio
RX Radio
RX Radio
TX Radio
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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
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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.
19SDP 11 PDR Team Goeckel
MDR DeliverableThe 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.
20SDP 11 PDR Team Goeckel
MDR DeliverableThe 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.
21SDP 11 PDR Team Goeckel
Questions?