Vpriv Ready

VPriv: Protecting Privacy in Location-Based Vehicular Services Raluca Ada Popa and Hari Balakrishnan Computer Science and Artificial Intelligence Laboratory, M.I.T. Andrew Blumberg Department of Mathematics Stanford University (Part of the CarTel project http://cartel.csail.mit.edu/doku.php)

Motivation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Problem: Serious threat to the locational privacy of drivers!

Example: E-ZPass Account Information ,[object Object],[object Object],[object Object],[object Object],Ideally: server computes tolling cost without knowing time and location information Antenna

Outline ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

VPriv ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Model ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Goals ,[object Object],[object Object],[object Object],Definition: The server learns no more information from computing f on a database of <tag, time, location> than from analyzing a database with <time, location> and the result of f. ,[object Object],[object Object],[object Object],[object Object],[object Object]

VPriv’s Architecture ,[object Object],[object Object],[object Object],[object Object],[object Object]

General Protocol ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Applications ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Outline ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Secure Multi-Party Computation ,[object Object],[object Object],[object Object],[object Object],[object Object]

Tolling Protocol ,[object Object]

Crypto Tools ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Notation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Tolling Protocol ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Challenge Phase

Challenge Phase (cont’d) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Related Protocols: Speeding ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Enforcement ,[object Object],[object Object],[object Object],[object Object],[object Object]

Random spot checks ,[object Object],[object Object],[object Object],[object Object],[object Object]

Outline ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Evaluation ,[object Object],[object Object],[object Object],[object Object],[object Object],Range size of 1000 tags =

Evaluation: Implementation ,[object Object],Protocol running time # 10 4 of tags downloaded from server Time (s)

Evaluation: Enforcement ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Evaluation: Enforcement (cont’d) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Simulation Results ,[object Object],percentage of paths observed Number of police cars placed

Security Analysis ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Enforcement scheme Check tuples at server, Upload more than once

Related Work ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Conclusions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Protocol (One Round) Information known by both parties: <s j , t j >, c(f k (v i )) Client Server ,[object Object],[object Object],<f k (s j ), c[t j ]> ,[object Object],[object Object],[object Object],[object Object],b If b=0, k, d[k], t j , d[t j ]; If b=1, f k (v i ), d[f k (v i )], D ,[object Object],[object Object]

Enforcement Check ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Downloading a subset of tuples ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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