Securing context-aware applications using environment roles
SACMAT '01 Proceedings of the sixth ACM symposium on Access control models and technologies
COCA: A secure distributed online certification authority
ACM Transactions on Computer Systems (TOCS)
A model of OASIS role-based access control and its support for active security
ACM Transactions on Information and System Security (TISSEC)
ACM Transactions on Information and System Security (TISSEC)
Preserving Privacy in Environments with Location-Based Applications
IEEE Pervasive Computing
On context in authorization policy
Proceedings of the eighth ACM symposium on Access control models and technologies
Cerberus: A Context-Aware Security Scheme for Smart Spaces
PERCOM '03 Proceedings of the First IEEE International Conference on Pervasive Computing and Communications
Towards Practical Automated Trust Negotiation
POLICY '02 Proceedings of the 3rd International Workshop on Policies for Distributed Systems and Networks (POLICY'02)
SD3: A Trust Management System with Certified Evaluation
SP '01 Proceedings of the 2001 IEEE Symposium on Security and Privacy
Trust-X: A Peer-to-Peer Framework for Trust Establishment
IEEE Transactions on Knowledge and Data Engineering
Distributed Proving in Access-Control Systems
SP '05 Proceedings of the 2005 IEEE Symposium on Security and Privacy
Automated trust negotiation using cryptographic credentials
Proceedings of the 12th ACM conference on Computer and communications security
PeerAccess: a logic for distributed authorization
Proceedings of the 12th ACM conference on Computer and communications security
Secure context-sensitive authorization
Pervasive and Mobile Computing
Safety and consistency in policy-based authorization systems
Proceedings of the 13th ACM conference on Computer and communications security
Lightweight cnsistency enforcement schemes for distributed proofs with hidden subtrees
Proceedings of the 12th ACM symposium on Access control models and technologies
Enforcing Safety and Consistency Constraints in Policy-Based Authorization Systems
ACM Transactions on Information and System Security (TISSEC)
Scalability in a secure distributed proof system
PERVASIVE'06 Proceedings of the 4th international conference on Pervasive Computing
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Previous work has shown that distributed authorization systems that fail to sample a consistent snapshot of the underlying system during policy evaluation are vulnerable to a number of attacks. Unfortuantely, the consistency enforcement solutions presented in previous work were designed for systems in which only CA-certified evidence is used during the decision-making process, all of which is available to the decision-making node at runtime. In this article, we generalize previous results and present light-weight mechanisms through which consistency constraints can be enforced in proof systems in which the full details of a proof may be unavailable to the querier due to information release policies, and the existence of certificate authorities for certifying evidence is unlikely; these types of distributed proof systems are likely candidates for use in pervasive computing and sensor network environments. We present modifications to one such distributed proof system that enable three types of consistency constraints to be enforced while still respecting the same confidentiality and integrity policies as the original proof system. We then discuss how these techniques can be adapted and applied to other, less restrictive, distributed proof systems. Further, we detail a performance analysis that illustrates the modest overheads of our consistency enforcement schemes.