Security without identification: transaction systems to make big brother obsolete
Communications of the ACM
The active badge location system
ACM Transactions on Information Systems (TOIS)
Scalable, secure, mobile computing with location information
Communications of the ACM - Special issue on computer augmented environments: back to the real world
Some computer science issues in ubiquitous computing
Communications of the ACM - Special issue on computer augmented environments: back to the real world
Research issues in ubiquitous computing
PODC '94 Proceedings of the thirteenth annual ACM symposium on Principles of distributed computing
GeoCast—geographic addressing and routing
MobiCom '97 Proceedings of the 3rd annual ACM/IEEE international conference on Mobile computing and networking
Location-aided routing (LAR) in mobile ad hoc networks
MobiCom '98 Proceedings of the 4th annual ACM/IEEE international conference on Mobile computing and networking
Multi-sensor location tracking
MobiCom '98 Proceedings of the 4th annual ACM/IEEE international conference on Mobile computing and networking
GPS-based geographic addressing, routing, and resource discovery
Communications of the ACM
Location-aided routing (LAR) in mobile ad hoc networks
Wireless Networks
Concepts for personal location privacy policies
Proceedings of the 3rd ACM conference on Electronic Commerce
Using mobile code to create ubiquitous augmented reality
Wireless Networks - Selected Papers from Mobicom'99
A Comparison of Protocols for Updating Location Information
Cluster Computing
Security Considerations for a Distributed LocationService
Journal of Network and Systems Management
Exploiting context to support social awareness and social navigation
ACM SIGGROUP Bulletin
The design and applications of a context service
ACM SIGMOBILE Mobile Computing and Communications Review
On the Move to Meaningful Internet Systems, 2002 - DOA/CoopIS/ODBASE 2002 Confederated International Conferences DOA, CoopIS and ODBASE 2002
ACTIVE MAP: A Visualization Tool for Location Awareness to Support Informal Interactions
HUC '99 Proceedings of the 1st international symposium on Handheld and Ubiquitous Computing
User interaction with machines on the move: location aware computing
WET-ICE '95 Proceedings of the 4th Workshop on Enabling Technologies: Infrastructure for Collaborative Enterprises (WET-ICE'95)
Proceedings of the 1st ACM international workshop on Wireless mobile applications and services on WLAN hotspots
Implementing access control to people location information
Proceedings of the ninth ACM symposium on Access control models and technologies
An architecture for privacy-sensitive ubiquitous computing
Proceedings of the 2nd international conference on Mobile systems, applications, and services
CPOL: high-performance policy evaluation
Proceedings of the 12th ACM conference on Computer and communications security
Access control to people location information
ACM Transactions on Information and System Security (TISSEC)
Mobile Networks and Applications - Special issue: Wireless mobile wireless applications and services on WLAN hotspots
Context-aware handover using active network technology
Computer Networks: The International Journal of Computer and Telecommunications Networking
Anonymous Usage of Location-Based Services Through Spatial and Temporal Cloaking
Proceedings of the 1st international conference on Mobile systems, applications and services
Privacy-aware location sensor networks
HOTOS'03 Proceedings of the 9th conference on Hot Topics in Operating Systems - Volume 9
EURASIP Journal on Applied Signal Processing
Mobile agent location management in global networks
ICCOMP'05 Proceedings of the 9th WSEAS International Conference on Computers
Experiences from developing a distributed context management system for enabling adaptivity
DAIS'07 Proceedings of the 7th IFIP WG 6.1 international conference on Distributed applications and interoperable systems
Nomatic: location by, for, and of crowds
LoCA'06 Proceedings of the Second international conference on Location- and Context-Awareness
Prottoy: a middleware for sentient environment
EUC'05 Proceedings of the 2005 international conference on Embedded and Ubiquitous Computing
SP'04 Proceedings of the 12th international conference on Security Protocols
Towards summarized representation of time series data in pervasive computing systems
UIC'06 Proceedings of the Third international conference on Ubiquitous Intelligence and Computing
Protecting user data in ubiquitous computing: towards trustworthy environments
PET'04 Proceedings of the 4th international conference on Privacy Enhancing Technologies
PERVASIVE'05 Proceedings of the Third international conference on Pervasive Computing
Proximation: location-awareness though sensed proximity and GSM estimation
LoCA'05 Proceedings of the First international conference on Location- and Context-Awareness
Koi: a location-privacy platform for smartphone apps
NSDI'12 Proceedings of the 9th USENIX conference on Networked Systems Design and Implementation
Middleware for location privacy: an overview
Proceedings of the 2012 ACM Research in Applied Computation Symposium
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To take full advantage of the promise of ubiquitous computing requires the use of location information, yet people should have control over who may know their whereabouts. We present an architecture that achieves these goals for an interesting set of applications. Personal information is managed by User Agents, and a partially decentralized Location Query Service is used to facilitate location-based operations. This architecture gives users primary control over their location information, at the cost of making more expensive certain queries, such as those wherein location and identity closely interact. We also discuss various extensions to our architecture that offer users additional trade-offs between privacy and efficiency. Finally, we report some measurements of the unextended system in operation, focusing on how well the system is actually able to track people. Our system uses two kinds of location information, which turn out to provide partial and complementary coverage.