Hannah B. Pasandi

Text, Voice, and Video Privacy

Privacy and security systems derived from cross-layer structure in 5G, Wi-Fi, voice agents, and satellite access.

Cellular and Wireless Privacy

Undertone

Privacy evaluation for agentic voice assistants.
four leakage channelsmodel agnostic harnesscontextual leakage lens

Undertone measures privacy leaks that happen inside the agent, not the acoustic signal. It combines voice privacy metrics with contextual integrity for assistants that remember, plan, and call tools.

the leak is inside the agent, not the audiovoiceagentremember · plan · callspeaker identitycross-speaker memorytool callsparalinguisticsfour leakage channels, model-agnostic harness
Cellular and Wireless Privacy

ACI Guard

Defense lens for acoustic context injection.
0.64 mean leakage under attack96.9% leakage reductiontool gate

ACI Guard models attacks where a spoken instruction enters through audio and leaks through a tool action. It evaluates contextual integrity gates for shared agentic voice assistants.

a spoken instruction should not trigger a tool leakaudio injectagenttool actionCI gatecontextual-integrity gate · 96.9% leakage reduction
accepted · xr security

Winnow

a decoy-aware adversary defeats ghost-keystroke defenses in virtual reality

VR virtual keyboards leak what you type through your avatar's hands, and the proposed fix injects decoy "ghost" keystrokes to hide the real ones. Winnow is the adversary that calls the bluff: aware that decoys exist, it filters them and recovers the input, showing the defense class needs a stronger foundation than plausible noise.

VR headset real ghost ghost real decoy-aware filter recovers the typed input the defense needs more than noise

Also in this line: Evaluation of ASR Systems for Conversational Speech (ACM SenSys '22 workshop), conversational-speech accuracy rather than a privacy result.