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Privacy-Preserving Stream Aggregation

Privacy-Preserving Stream Aggregation. Elaine Shi (PARC/UC Berkeley), T-H. Hubert Chan (HKU), Eleanor Rieffel ( FXPal ), Richard Chow (PARC), Dawn Song (UC Berkeley). Privacy in Smart Grids. Smart grid operator. Time-series data. Privacy in Population Surveys.

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Privacy-Preserving Stream Aggregation

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  1. Privacy-Preserving Stream Aggregation Elaine Shi (PARC/UC Berkeley), T-H. Hubert Chan (HKU), Eleanor Rieffel (FXPal), Richard Chow (PARC), Dawn Song (UC Berkeley)

  2. Privacy in Smart Grids Smart grid operator Time-series data

  3. Privacy in Population Surveys

  4. How can we allow a data aggregator to perform data analytics, while preserving individual privacy?

  5. Our Results – Privacy Notion

  6. Computing on Multiple Users’ Encrypted Data

  7. Homomorphic Encryption? (PK, SK)

  8. New Paradigm SK5 SK4 SK1 SK3 SK2

  9. New Paradigm Evaluate SK4 SK5 SK3 SK2 SK1

  10. Expressiveness: Summation Evaluate

  11. Expressiveness: Distributions Evaluate

  12. Aggregate Once: Simple Construction SK4 SK5 SK3 SK2 SK1

  13. Aggregate Once: Simple Construction … … SK4 SK5 SK3 SK2 SK1

  14. Aggregate Once: Simple Construction … … SK4 SK5 SK3 SK2 SK1

  15. Multiple Time Steps … … SK4 SK5 SK3 SK2 SK1

  16. Differential Privacy against an Untrusted Aggregator

  17. Differential Privacy [Dwork06] ? 0 0 1 1 1 1 0 1 1 1 8 neighboring vectors x and x’, 8 sets of transcripts S: Pr [π (x) є S] ≤ exp(ε) ∙ Pr [π (x’) є S]

  18. Naïve Scheme Error: v1+ r1 v2+ r2 v3+ r3 v4+ r4 v5+ r5

  19. Crypto + Differential Privacy Error: … … Enc(v1+ ρ1) Enc(v5+ ρ5)

  20. Open Problems and Future Work • More expressive queries • Larger plaintext space • Fault tolerance [CSS10] • Reduce privacy loss over multiple time steps [CSS10]

  21. Take-Home Messages • Differential Privacy against an Untrusted Aggregator • The Power of Combining Cryptography and Differential Privacy

  22. Thank you!

  23. Our Results – Property • Periodic aggregation • Non-interactive • No interactions among users • Users upload ciphertext to aggregator, and no more communication needed

  24. Power of Combining Crypto and Differential Privacy [CSS10]

  25. Privacy in Sensor Networks • Building monitoring • Employee sensing • Body sensor nets • …

  26. Privacy in Market Research

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