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oai:www.ideals.illinois.edu:2142/81833 2023-07-11 col_2142_5131 col_2142_10761 com_2142_5130 com_2142_10755 com_2142_234

Winslett, Marianne Lee, Adam J. 2015-09-25T20:20:37Z 2015-09-25T20:20:37Z 10000-01-01 2008 2008 We first show that existing ABAC theory does not properly account for the asynchronous nature of open systems, which allows attackers to subvert these systems by forcing decisions to be made using inconsistent system states. To address this, we develop provably-secure and lightweight consistency enforcement mechanisms suitable for use in trust negotiation and distributed proof systems. We next focus on deployment issues, and investigate how user interactions can be audited in the absence of concrete user identities. We develop the technique of virtual fingerprinting, which can be used to accomplish this task without adversely affecting the scalability of audit systems. Lastly, we present TrustBuilder2, which is the first fully-configurable framework for trust negotiation. Within this framework, we examine availability problems associated with the trust negotiation process and develop a novel approach to policy compliance checking that leverages an efficient pattern-matching approach to outperform existing techniques by orders of magnitude. Made available in DSpace on 2015-09-25T20:20:37Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 3337839.pdf: 3413888 bytes, checksum: b59d0f40bb8678763fa4a9f9c3043a64 (MD5) Previous issue date: 2008 Embargo set by: Seth Robbins for item 83114 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 208 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2008. http://hdl.handle.net/2142/81833 (MiAaPQ)AAI3337839 eng Computer Science Towards Practical and Secure Decentralized Attribute -Based Authorization Systems text Computer Science Computer Science University of Illinois at Urbana-Champaign Dissertation Ph.D.