1. Aditya Wagh

2.  Importance of Evidence Collection  Present Systems are inadequate ◦ Closed Circuit TV  Scalability issues + Centralized operation  Untapped vehicular resources

4.  Less vulnerable to attack  Scalable  Multiple sensors might be tracking a Target  In this case, VSN is built on top of VANET (basic communication capability)

5.  Sensors deployed on vehicles  Collect data and process locally  Summary Repository  Summary Collection

6.  Bloom Filtering  Police vehicles broadcast Bloom signatures  Other vehicles compute missing packets  One vehicle will reply with necessary packets  Police vehicle will respond with ACK carrying list of received packets  On repeating this 5 times, the packet loss due to false positives is 10^(-12)

7.  Vehicles have 802.11 connectivity  11 Mbps  Radio range: 100 – 300 meters  Speed: 10 m/s  Real map of Westwood 2400 x 2400  Real Track model used

8.  Presents an opportunistic and decentralized approach to evidence collection / monitoring  System is shown to be scalable up to thousands of nodes  VANET implementation is still pending and will take over a decade once these systems are put into production