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Contextual Privacy: the Interplay of Sensitivity & Context Dr. Rula Sayaf
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Disclaimer
I am only a computer scientist. I have no proper education in any other field.
All the terms in this talk are limited to the context of Computer Science.
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Motivation
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Contextual Privacy ≈ Control(Sensitive Data, Context)
Contextual Privacy
PETs ≈ Control(? Data, ?)
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Contextual Privacy
Contextual Privacy
Sensitive Data Context
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Challenges: Define Sensitivity
Military
Non-Military
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Sensitivity Function f(x)
Challenges: Defining Sensitivity
Topics
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Challenges: Context & Sensitivity
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Work Colleagues
Family
Cool Guys
Fun at home
Inappropriate
Challenges: Context & Sensitivity
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Work Colleagues
Family
Cool Guys
Fun at home
Contextual Privacy
C1 C2
C3
C4 C5
C6 C7
C8
C9
…..
Cn
Cn+1
Cn+2
Cn+3
Cn+4
Cn+5
Cn+6
Cn+7
Cn+8
Inappropriate
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Work Colleagues
Contextual Privacy
Inappropriate
Sensitivity Function f(x)
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Contextual Privacy Analysis
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Search Data
Search Query: “How to get blue curly hair”
History “How to get blue curly hair” “Psychiatrist in Springfield” “Online dating” Manage Search History
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Big Search Data
226,000,000 400,000 US users
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Big Search Data
Search Query
Topics Time Context
Offline (User) Online (Data)
Deleted Sensitivity User
Health & beauty Q&A
Home Browser X
Search Query: “How to get blue curly hair”
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Sensitivity Analysis
Questions - Is there one general pattern? (Topic=X) + (Context=Y) + (Time=Z) => Item is Deleted => Sensitive - What are the factors that affect sensitivity? - Topics - Context - Subjectivity - Temporality
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Context Analysis
Questions - Does context affect disclosure patterns? If (Context = Y) => Disclose (Topic=X) - Does context affect post-disclosure patterns (sensitivity management patterns)? Or
does adding more contextual information affect the accuracy of the pattern?
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Contextual Sensitivity
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Topics Sensitivity
19
Sensitive topics vary across users!
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Sensitivity Pattern
There exists pattern explaining the behaviour of the 400,000 users
(Content=Health) + (Context=Home) + (Time=Noon) => Item is Sensitive
Sensitivity could not be predicted with topics only!
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• Adult • Celebrities • Night Life • Health • Name of Non-celebrities • Clothes and Shoes • Flight status Common world knowledge of sensitivity is insufficient!
Sensitivity Topics
Topics that indicate sensitivity vary from what is expected to be sensitive!
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Online Context: • Search History • Vertical Change (Web, Image, Video) • Safe search setting = Strict Offline Context: • Windows Live Users • Non-Facebook Users • Time
Sensitivity Contexts
Sensitivity could be affected by the interest, and the type of services users
are exposed to!
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Sensitivity Temporality
Patterns vary over time – and across users too
Topics and contexts determination of sensitivity is temporal and subjective!
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Sensitivity Pattern
Context
Content
Subjectivity
Temporality
Sensitivity Function f(x)
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Context & Disclosure
Context affects the disclosure of sensitive topics!
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Context & Post-disclosure
More information about context => a higher prediction accuracy Online Context • Anonymiser type: - Inactive
- Active (negative effect) Offline Context • Organisation type:
- Government State - Medical and Dental Services - Finance - Religious Organizations
- The more context, the better the understanding of sensitivity!
- Using PETs affects actions to protect sensitive data!
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Work Colleagues
Contextual Privacy
Inappropriate
Sensitivity Function f(x)
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Conclusions
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Multiple Ingredients
Topics, contexts, time, subjectivity, and possibly other aspects …
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Sensitivity or Inappropriateness Requires users involvements to decide
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Deletions Illusion?
Expect actual deletions with the GDPR?
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Sensitivity in Courts?
Report a violation by selling a search
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Thanks! Any questions?
@privacyhole [email protected]
PhD Thesis: Contextual Privacy: the Interplay of
Sensitivity and Context is available here The work in this thesis has been completed partially at
Microsoft Research, Cambridge.
? Template: Slidescarnival