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<![CDATA[Ph.D. Dissertation Defense - Haichuan (Ken) Xu]]>
Title: Extracting Hidden, Protected, and Deleted User Interaction Contexts from Applications and AI SystemsCommittee:
Dr. Brendan Saltaformaggio, ECE, Chair, Advisor
Dr. Saman Zonouz, ECE
Dr. Michael Specter, CoC
Dr. Frank Li
Dr. Ozgur Ozmen, ASU
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In this dissertation, I make hidden, protected, and deleted interaction context measurable and actionable by extracting it from real software stacks. In DVa, I uncover victim apps and attribute victim-specific a11y abuse vectors by combining victim modeling with abuse-vector-guided symbolic analysis on real malware. In SOMBRA, I identify where app-side a11y protections fail to transfer to mobile websites by modeling and comparing the a11y information exposed by native apps and by browser-rendered counterparts across four different browsers. In ORISA, I recover and rehost deleted conversation context from local LLM apps by extracting and realigning batch tokens and KV cache state so investigators can interrogate a live session with recovered context.]]>
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