Research

Privacy and systems

Research in encrypted data processing, cryptographic authorization, distributed systems, data ownership, and low-power networks.

TimeCrypt

Cloud analytics over sensitive time-series data creates a tension between utility and confidentiality. TimeCrypt provides scalable, real-time analytics over encrypted streams with cryptographic access control and verifiable queries.

Project Paper Extended version

Droplet

Sharing IoT data should not require a trusted intermediary. Droplet combines encrypted streams with decentralized authorization to provide fine-grained, resilient access control across trust domains.

Project Paper

Pilatus

Cloud-backed mobile and IoT applications need selective sharing without surrendering confidentiality. Pilatus combines partially homomorphic encryption, re-encryption, revocation, and in-place key updates in a practical data-protection platform.

Paper Code

Talos

Encrypted cloud storage is most useful when applications can still query it. Talos brings encrypted query processing to constrained IoT devices through practical cryptographic schemes and hardware-aware optimization.

Project Paper Code

Proximity-based authentication

Co-located devices need a fast way to reject remote impostors. This work uses ambient radio signals to infer proximity in-band with commodity low-power wireless hardware.

Paper Code Demo

Wireless interference mitigation overview

Low-power wireless coexistence

Heterogeneous radios in unlicensed spectrum interfere in uncertain ways. This research developed cognitive systems that detect cross-technology interference and apply effective countermeasures.

TIIM CrossZig CIG