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Executive Director and Endowed Chair

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1 Executive Director and Endowed Chair
CS 5323 Privacy Prof. Ravi Sandhu Executive Director and Endowed Chair Lecture 15 © Ravi Sandhu World-Leading Research with Real-World Impact!

2 Security versus Privacy
© Ravi Sandhu World-Leading Research with Real-World Impact! 2

3 Security versus Privacy
© Ravi Sandhu World-Leading Research with Real-World Impact! 3

4 Security and Privacy Objectives
USAGE purpose INTEGRITY modification AVAILABILITY access CONFIDENTIALITY disclosure © Ravi Sandhu World-Leading Research with Real-World Impact! 4

5 Privacy Goals Browsing privacy Interaction privacy Drive-by privacy
Data disclosure privacy …… © Ravi Sandhu World-Leading Research with Real-World Impact! 5

6 Privacy Legislation in USA
Case by case approach Fragmented Reactive Fair Credit Reporting Act (FCRA), 1970 Privacy Act 1974 Family Educational Rights & Privacy Act (FERPA), 1974 Video Privacy Protection Act (VPAA) 1988 Health Insurance Portability and Accountability Act (HIPAA) 1996 Gramm-Leach-Bliley Act (GLBA) 1999 ……… © Ravi Sandhu World-Leading Research with Real-World Impact! 6

7 3 Ongoing Experiments World-Leading Research with Real-World Impact!
© Ravi Sandhu World-Leading Research with Real-World Impact! 7

8 Data Disclosure Syntactic Anonymity Differential Privacy
Clifton, Chris, and Tamir Tassa. "On Syntactic Anonymity and Differential Privacy." Transactions on Data Privacy 6, no. 2 (2013): © Ravi Sandhu World-Leading Research with Real-World Impact!

9 Data Disclosure PPDP Privacy-Preserving Data Publication Suppression
Generalization Rearrange PPDM Privacy-Preserving Data Mining Respond to queries on the data Add random noise © Ravi Sandhu World-Leading Research with Real-World Impact! 9

10 Data Disclosure ?? Syntactic anonymity Differential privacy PPDP
Privacy-Preserving Data Publication Suppression Generalization Rearrange PPDM Privacy-Preserving Data Mining Respond to queries on the data Add random noise ?? Syntactic anonymity Differential privacy © Ravi Sandhu World-Leading Research with Real-World Impact! 10

11 Data Disclosure Syntactic Anonymity
© Ravi Sandhu World-Leading Research with Real-World Impact!

12 k-Anonymization World-Leading Research with Real-World Impact! quasi-
Identifiers QIs sensitive attribute generalization QI block QI block © Ravi Sandhu World-Leading Research with Real-World Impact! 12

13 l-Diversity World-Leading Research with Real-World Impact!
Frequency of occurrence of sensitive attribute QI block ≤ 1/3 © Ravi Sandhu World-Leading Research with Real-World Impact! 13

14 stricter than l-diversity
t-Closeness Frequency of occurrence of sensitive attribute QI block ≤ 1/3 Distribution in each QI block should be t-close to distribution in entire population stricter than l-diversity © Ravi Sandhu World-Leading Research with Real-World Impact! 14

15 weaker than l-diversity
p-Sensitivity at least p distinct values in each QI block QI block weaker than l-diversity © Ravi Sandhu World-Leading Research with Real-World Impact! 15

16 Anatomy Anonymization
randomly shuffle Sensitive attribute in each QI block © Ravi Sandhu World-Leading Research with Real-World Impact! 16

17 Curse of Dimensionality
Given a large number of Quasi-Identifiers, need to suppress most of the table to achieve k-anonymity LKC-privacy for high dimensional data: Attacker knows at most L quasi-identifiers Every combination of L quasi-identifiers is shared by at least K records Diversity in each group of K is not more than 1/C Release different versions of the data with different Quasi-Identifiers for different research purposes © Ravi Sandhu World-Leading Research with Real-World Impact! 17

18 Data Disclosure Differential Privacy
© Ravi Sandhu World-Leading Research with Real-World Impact!

19 Intuition Database 1 PPDM Database 2
Query Response PPDM Cannot tell which Database is used within specified probability Differ in only 1 record © Ravi Sandhu World-Leading Research with Real-World Impact! 19

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