Annual Workshop February 5th, 2014. A Formal Approach to Analyze Privacy in Electronic Services. MSEC Koen Decroix. Outline. Introducing Privacy in Loyalty Services Conceptual model of inShopnito Framework for Formal Reasoning on Privacy Privacy Analysis of inShopnito Conclusions.
February 5th, 2014
A Formal Approach to Analyze Privacy in Electronic Services
[Koen Decroix – MSEC - KU Leuven]
Ever wondered what companies know about you?
… Max Schrems, an Austrian student, did!
Now he sues Facebook for their data practices on the personal data they collected about him.
For the convenience of their customers, loyalty services evolved to electronic services integrated with other online (third-party) services. Is this the full story?
Share your shopping activities with friends on Facebook
Not transparent to users
When registering to such services, you agreed with their terms and policies and gave them your consentfor collecting, processing, and forwarding your personal data.
Your past online activities leave non-erasable, possibly harmful, traces behind and might get spread around.
Citizens must be protected for these data practices.
This is where the European data protection legislation comes into play.
… designers have to consider multiple types of requirements
Need for formal modeling, as a support during design of composite services.
Privacy analysis is based on user profiles built from the formal models. Its feedback must be useful for system designers and users as well.
Collecting loyalty points at first glance.
… but looking into more detail …
From specifications of service providers’ data practices (= service policies), we can derive that …
Conceptual model of inShopnito
System Independent Model
Privacy Analysis - Feedback
inShopnito modeled for two user types
Advertisers are not trusted
No trust in organizations
Loyalty credential: Idemix what if X509 is used?
Linkabilities in inShopnito
Advertisers not allowed to have the customer’s his:
Violations of rules 1, 2, 3 are found only in case a X509 certificate is used in case of the user model