SMUCSE 8394 BTS – Communication Technologies

SMUCSE 8394 Objectives To establish and maintain a unifying exchange and sharing framework for different types of data Information exchange essential –To pre-emergency planning –Critical first response actions, relief efforts, and community recovery –Greatly enhance daily operations and cooperation among agencies in meeting homeland defense responsibilities Where the world is going –Web-based spatial decision support system where multiple agencies can rapidly share and exchange their GIS databases and remotely sensed imagery

SMUCSE 8394 Technology Components Command, Control and Communications –Dispatch –Force management –Radio and data communications –Geographical Information Systems (GIS) –Global positioning system (GPS)

SMUCSE 8394 Benefits of GIS Deploy response capabilities. Locate resources Improve planning capabilities Develop training scenarios Improve accuracy Provide timely decision support Develop contingency plans.

SMUCSE 8394 GIS for HS

SMUCSE 8394 GIS for Emergency Response Identifying the location of schools, medical centers, staging areas, and evacuation routes Analysis can identify transportation choke points near bridges or overpasses Route response vehicles Quickly identify critical infrastructures such as water storage/treatment facilities, communication networks, electric generation facilities, refineries, and more

SMUCSE 8394 Global Positioning System (GPS) Worldwide radio-navigation system formed from a constellation of 24 satellites and their ground stations –Position identified based on triangulation from 3 satellites – Uses 2 carrier frequencies (L1 and L2) –Two types PRCodes (C/A and P) –P could be encrypted  Y code

SMUCSE 8394 GPS Applications Location - determining a basic position Navigation- getting from one location to another Tracking - monitoring the movement of people and things Mapping - creating maps of the world Timing - bringing precise timing to the world

SMUCSE 8394 Communication Infrastructure Requirements –Reliability –Security –Inter-operability New initiatives Usual suspects –Satellite communication –Microwave links –Infrared channels –Fiber-optic links –Wireless

SMUCSE 8394 Starting from the Bottom Sensor Networks

SMUCSE 8394 What Where & When What? –Low cost, low power, multi-functional sensor nodes –Communicates within short distances –Enabled by MEMS, wireless, and digital electronics Where: –Military, health, environmental

SMUCSE 8394 Ad hoc Networks vs. SNs Number of nodes several orders larger Densely deployed More prone to failures Dynamic topology (frequent changes) SNs use broadcasts instead of PP Power, CPU, and memory limitations No global IDS

SMUCSE 8394 Applications Military/BTS –c4ISRT, NBC detection etc. Environmental –Forest fire, bio-complexity analysis, flood detection Health –Tele-monitoring, tracking, drug admin.

SMUCSE 8394 Applications (cont’d) Commercial –Environmental control of office buildings $55 b savings/year, reduction of 35 mmt of carbon emission –Detection of vehicle thefts –Inventory control

SMUCSE 8394 Design Factors Fault tolerance Scalability Cost ~= $1/node –Cheap BT is 10 times more costly Hardware constraints Transmission constraints Power constraints

SMUCSE 8394 Security in Sensor Networks To provide –Confidentiality –Authenticity, integrity –Timeliness – freshness With minimum power consumption –Minimize communication – key exchanges –Private key encryption

SMUCSE 8394 Trust Model Sensor Nodes are not trusted Sink node part of the trusted network Sink node and the sensor nodes share secret Node trusts its own resources –Clock, memory etc.

SMUCSE 8394 SPIN – Two Protocols Secure Network Encryption Protocol (SNEP) –Provides confidentiality, authentication, freshness between endpoints µTESLA - Micro Timed Efficient Stream Loss-tolerant Authentication –Provides broadcast authentication

SMUCSE 8394 Encryption Details SNEP Private key encryption –DES-CBC –Derive subsequent keys from the original shared key using RC5 –Use counter mechanism for freshness µTESLA –Authenticated broadcast –Use of public key too expensive, use modified shared key (delayed disclosure)