Authentication and authenticated key exchanges
Designs, Codes and Cryptography
Providing location information in a ubiquitous computing environment (panel session)
SOSP '93 Proceedings of the fourteenth ACM symposium on Operating systems principles
The Cricket location-support system
MobiCom '00 Proceedings of the 6th annual international conference on Mobile computing and networking
Untraceable electronic mail, return addresses, and digital pseudonyms
Communications of the ACM
Securing context-aware applications using environment roles
SACMAT '01 Proceedings of the sixth ACM symposium on Access control models and technologies
TRBAC: A temporal role-based access control model
ACM Transactions on Information and System Security (TISSEC)
Certificate chain discovery in SPKI?SDSI
Journal of Computer Security
Security Considerations for a Distributed LocationService
Journal of Network and Systems Management
Project Aura: Toward Distraction-Free Pervasive Computing
IEEE Pervasive Computing
Preserving Privacy in Environments with Location-Based Applications
IEEE Pervasive Computing
ESORICS '00 Proceedings of the 6th European Symposium on Research in Computer Security
A General and Flexible Access-Control System for the Web
Proceedings of the 11th USENIX Security Symposium
Distributed credential chain discovery in trust management
Journal of Computer Security
On context in authorization policy
Proceedings of the eighth ACM symposium on Access control models and technologies
A Context-Aware Security Architecture for Emerging Applications
ACSAC '02 Proceedings of the 18th Annual Computer Security Applications Conference
Providing Contextual Information to Pervasive Computing Applications
PERCOM '03 Proceedings of the First IEEE International Conference on Pervasive Computing and Communications
Cerberus: A Context-Aware Security Scheme for Smart Spaces
PERCOM '03 Proceedings of the First IEEE International Conference on Pervasive Computing and Communications
Trust for Ubiquitous, Transparent Collaboration
PERCOM '03 Proceedings of the First IEEE International Conference on Pervasive Computing and Communications
A Policy Language for a Pervasive Computing Environment
POLICY '03 Proceedings of the 4th IEEE International Workshop on Policies for Distributed Systems and Networks
Beyond Proof-of-Compliance: Safety and Availability Analysis in Trust Management
SP '03 Proceedings of the 2003 IEEE Symposium on Security and Privacy
A Logical Reconstruction of SPKI
CSFW '01 Proceedings of the 14th IEEE workshop on Computer Security Foundations
Anonymous Connections and Onion Routing
SP '97 Proceedings of the 1997 IEEE Symposium on Security and Privacy
Decentralized user authentication in a global file system
SOSP '03 Proceedings of the nineteenth ACM symposium on Operating systems principles
Semantic Web in the Context Broker Architecture
PERCOM '04 Proceedings of the Second IEEE International Conference on Pervasive Computing and Communications (PerCom'04)
Implementing access control to people location information
Proceedings of the ninth ACM symposium on Access control models and technologies
Role-based cascaded delegation
Proceedings of the ninth ACM symposium on Access control models and technologies
SECURECOMM '05 Proceedings of the First International Conference on Security and Privacy for Emerging Areas in Communications Networks
Can Ferris Bueller still have his day off? protecting privacy in the wireless era
HOTOS'07 Proceedings of the 11th USENIX workshop on Hot topics in operating systems
Spatiotemporal Access Control Enforcement under Uncertain Location Estimates
Proceedings of the 23rd Annual IFIP WG 11.3 Working Conference on Data and Applications Security XXIII
Protecting location privacy against spatial inferences: the PROBE approach
Proceedings of the 2nd SIGSPATIAL ACM GIS 2009 International Workshop on Security and Privacy in GIS and LBS
The PROBE Framework for the Personalized Cloaking of Private Locations
Transactions on Data Privacy
Protecting location privacy against inference attacks
Proceedings of the 17th ACM conference on Computer and communications security
Protecting location privacy against inference attacks
Proceedings of the 9th annual ACM workshop on Privacy in the electronic society
Privacy preservation in the dissemination of location data
ACM SIGKDD Explorations Newsletter
A historical probability based noise generation strategy for privacy protection in cloud computing
Journal of Computer and System Sciences
A survey of context data distribution for mobile ubiquitous systems
ACM Computing Surveys (CSUR)
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Ubiquitous computing uses a variety of information for which access needs to be controlled. For instance, a person's current location is a sensitive piece of information that only authorized entities should be able to learn. Several challenges arise in the specification and implementation of policies controlling access to location information. For example, there can be multiple sources of location information. The sources can be within different administrative domains, which might allow different entities to specify policies, and policies need to be flexible. We address these issues in our design of a distributed access control mechanism for a people location system. Our design encodes policies as digital certificates, which enables decentralized storage of policies. We also present an algorithm for the discovery of distributed certificates. Furthermore, we discuss several privacy issues and show how our design addresses them. To show feasibility of our design, we built an example implementation based on SPKI/SDSI certificates. Using measurements, we quantify the influence of access control on query processing time. We also discuss trade-offs between RSA-based and DSA-based signature schemes for digital certificates.