Ahmad Charba
University of Ottawa • Department of Computer Science
Fully Homomorphic Encryption & Cryptography
About Nguyen et al.'s vCCA security
December 2023
An analysis of security limitations and semantic notions bridging the gap between CPA and CCA2 security in fully homomorphic encryption (FHE). This report critiques the verified Chosen Ciphertext Attack (VCCA) frame proposed by Manulis and Nguyen, highlighting its theoretical robustness against underlying security models.
Internet of Things (IoT) Protocols & Authentication
DOLO: Data Over Light Onboarding for Smart Smoke Detectors
2023
Proposes "Data Over Light Onboarding" (DOLO), a novel onboarding protocol for smart smoke detectors utilizing ambient light sensors and standard smartphone camera flashes. This research framework replaces expensive and vulnerable SoftAP setups with secure, physically contained symmetric credential transfers.
A Survey of Behavioural Authentication in Internet of Things Ecosystems
April 2023
A comprehensive survey detailing mechanisms to identify and authenticate users continuously via localized IoT sensors. The study compares machine learning model variations (e.g., Random Forests, SVMs, and RNNs) analyzing continuous biometrics such as gait patterns, voice recognition, and touch gesture behavior.