A comment on the confinement problem
SOSP '75 Proceedings of the fifth ACM symposium on Operating systems principles
Universally Composable Security: A New Paradigm for Cryptographic Protocols
FOCS '01 Proceedings of the 42nd IEEE symposium on Foundations of Computer Science
Simulation-Based Security with Inexhaustible Interactive Turing Machines
CSFW '06 Proceedings of the 19th IEEE workshop on Computer Security Foundations
Privacy, accuracy, and consistency too: a holistic solution to contingency table release
Proceedings of the twenty-sixth ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems
Universally utility-maximizing privacy mechanisms
Proceedings of the forty-first annual ACM symposium on Theory of computing
A signature scheme with efficient protocols
SCN'02 Proceedings of the 3rd international conference on Security in communication networks
Differential privacy in new settings
SODA '10 Proceedings of the twenty-first annual ACM-SIAM symposium on Discrete Algorithms
Private memoirs of a smart meter
Proceedings of the 2nd ACM Workshop on Embedded Sensing Systems for Energy-Efficiency in Building
PrETP: privacy-preserving electronic toll pricing
USENIX Security'10 Proceedings of the 19th USENIX conference on Security
ICALP'06 Proceedings of the 33rd international conference on Automata, Languages and Programming - Volume Part II
Privacy-preserving smart metering
Proceedings of the 10th annual ACM workshop on Privacy in the electronic society
Private computation of spatial and temporal power consumption with smart meters
ACNS'12 Proceedings of the 10th international conference on Applied Cryptography and Network Security
On significance of the least significant bits for differential privacy
Proceedings of the 2012 ACM conference on Computer and communications security
Provably secure and subliminal-free variant of schnorr signature
ICT-EurAsia'13 Proceedings of the 2013 international conference on Information and Communication Technology
Differential privacy in intelligent transportation systems
Proceedings of the sixth ACM conference on Security and privacy in wireless and mobile networks
Privacy-preserving smart metering with regional statistics and personal enquiry services
Proceedings of the 8th ACM SIGSAC symposium on Information, computer and communications security
ZQL: a compiler for privacy-preserving data processing
SEC'13 Proceedings of the 22nd USENIX conference on Security
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A number of established and novel business models are based on fine grained billing, including pay-per-view, mobile messaging, voice calls, payas-you-drive insurance, smart metering for utility provision, private computing clouds and hosted services. These models apply fine-grained tariffs dependent on time-of-use or place of-use to readings to compute a bill. We extend previously proposed billing protocols to strengthen their privacy in two key ways. First, we study the monetary amount a customer should add to their bill in order to provably hide their activities, within the differential privacy framework. Second, we propose a cryptographic protocol for oblivious billing that ensures any additional expenditure, aimed at protecting privacy, can be tracked and reclaimed in the future, thus minimising its cost. Our proposals can be used together or separately and are backed by provable guarantees of security.