Invited Keynote Talk @ the 7th Workshop on Adaptive and Reflective Middleware (ARM'08). Co-located with Middleware 2008. December 1st 2008, Leuven, Belgium.

1. Trust in Pervasive Social Computing Licia Capra Dept of Computer Science University College London

2. EVOLUTION OF MOBILE TECHNOLOGY

3. TRANSFORMATION OF INTERNET USERS

4. A DIGITAL TAPESTRY

5. PERVASIVE SOCIAL COMPUTING

11. BROWSING THE TAPESTRY Joint work with Matteo Dell’Amico @ Eurecom Presented at the Joint iTrust and PST Conferences on Privacy, Trust Management and Security, June 08

18. = Intent & Competence

34. EXPERIMENTS – ROBUSTNESS 2583 5 5165 10 38741 25827 12914 No attack - Any 75 50 25 Role k Algorithm

35. EXPERIMENTS – ROBUSTNESS 2297 1285 334 2583 5 4459 2353 559 5165 10 33322 13371 3101 20493 8757 2012 10730 4759 1092 1 10 100 PPR 38741 25827 12914 No attack - Any 75 50 25 Role k Algorithm

36. EXPERIMENTS – ROBUSTNESS 1 34 2297 1285 334 2583 5 1 85 4459 2353 559 5165 10 1 3132 1 1185 1 348 Victim Other N-SOFIA 33322 13371 3101 20493 8757 2012 10730 4759 1092 1 10 100 PPR 38741 25827 12914 No attack - Any 75 50 25 Role k Algorithm

37. EXPERIMENTS – ROBUSTNESS Lower values of  improve attack resilience, at the expense (small) of accuracy 679 2264 41 1082 1 215 1 34 2297 1285 334 2583 5 1386 4409 132 2126 2 391 1 85 4459 2353 559 5165 10 31765 33064 2815 14718 197 5571 11182 19186 1311 8779 74 2649 3406 9599 469 4612 13 1040 Victim Other Victim Other Victim Other 1 10 100 SOFIA 1 3132 1 1185 1 348 Victim Other N-SOFIA 33322 13371 3101 20493 8757 2012 10730 4759 1092 1 10 100 PPR 38741 25827 12914 No attack - Any 75 50 25 Role k Algorithm

38. UNLOCKING THE TAPESTRY

40. UNLOCKING THE TAPESTRY Evaluate Browse Build

41. UNLOCKING THE TAPESTRY HOW TO BUILD AN UNLOCKED TAPESTRY

43. UNLOCKING THE TAPESTRY HOW TO BROWSE AN UNLOCKED TAPESTRY

45. UNLOCKING THE TAPESTRY HOW TO EVALUATE OUR APPROACHES