1. Towards Security and Privacy for Pervasive Computing Author ： Roy Campbell,Jalal Al-Muhtadi, Prasad Naldurg,Geetanjali Sampemane M. Dennis Mickunas.(2002) Presented by Shih Yu Chen

2. 2 Pervasive Computing SensorsProcessors Computers

3. 3 Features of pervasive computing Extending Computing Boundaries *Hardware and software → physical and virtual *Dull → interactive, dynamic, programmable Invisibility *Computers → blend in the background *Computerize → boost productivity Creating smart and sentient spaces *Embedded devices and sensors → sense

4. 4 Features of pervasive computing Context awareness *Capture the different context and situation information *Tailoring itself to meet their preferences Mobility and adaptability *As mobile as its users *Be able to adapt itself to environments

5. 5 Security Challenges The Extended Computing Boundary *Information and physical security become interdependent *Traditional mechanisms become inadequate Privacy Issues *Active sensors and computing capabilities↑→ threat↑ User Interaction Issues *Richer user-interface *Cannot easily be prevented from seeing and hearing

6. 6 Security Challenges Security Policies *Flexible and convenient method for defining and managing security policies *Heterogeneous interfaces↑ → difficult to manage Info Ops ( Information Operations ) *Actions taken that affect adversary information and information systems while defending one’s own information and information systems *Electronic information, digital communication

7. 7 Suggest solutions Authentication *Strike a balance between authentication strength and non- intrusiveness *Context decide how strong the authentication needs to be *Confidence values ： 0~1 *Employ multiple authentication → confidence value↑ *Access control decisions can now become more flexible by utilizing confidence information

8. 8 Suggest solutions Mist-Privacy Communication *Route packets using a hop-by-hop, handle-based routing protocol *Employ public key cryptography *Incoming handle ; outgoing handle Bob Mist router 1 2 3 4 515 192 789 910

9. 9 Security Requirements Transparency and unobtrusiveness Multilevel Context-Awareness Flexibility and customizability Interoperability Extended boundaries

10. 10 Conclusion Pervasive computing brings new challenges to security and privacy, which cannot be addressed by mere adaptation of existing security and privacy mechanisms. Unless security concerns are accommodated early in the design phase, pervasive computing environments will be rife with vulnerabilities.