“Every privacy decision is shaped by the path that leads to it.”

About Me

I am Riyadh, a Doctoral Researcher at the CISPA Helmholtz Center for Information Security. My research lies at the intersection of Human-Computer Interaction (HCI), Usable Security and Privacy, and Human-Centered Security. I study user behavior across different stages of interaction, from information discovery to privacy-related decision-making. I am also interested in immersive technologies (AR/VR) and their implications for security, privacy, and user experience. My goal is to bridge technical security and user-centered design to improve privacy-related user experiences.

I am currently a member of the Trusted Systems Group led by Dr. Sven Bugiel.

Research Interest

Usable Security and Privacy
Human Factors in Security and Privacy
Human-Computer Interaction (HCI)
Immersive Technologies (AR/VR)

Current Position

Ph.D. in Computer Science, 2024—Present
Saarland University, Germany
Doctoral Researcher, 2024—Present
CISPA Helmholtz Center for Information Security, Germany

Hobby

Collecting Coins and Banknotes from Around the World (102+ Countries)

Academic Activity

Thesis Advising

Bachelor's
1. Implicit Pupillary Biometrics Using RSVP for Continuous User Identification in Virtual Reality

Master's
1. LLM-Aware, Intent-Based Explanations for Android Permission Requests: A User-Centered Research
2. LLM-based permission recommenders for Android OS
3. Towards Invisible Authentication in XR: Investigating UI-Evoked Pupillary Responses [Ongoing]
4. Understanding Users’ Permission Decision Journeys in Mobile Apps [Ongoing]

Publication

2026 CHI

From Discovery to Decisions: Archetypal Journeys of Mobile App Users and Their Implications on Privacy
Glimpse: In this work, we trace how privacy-related judgments unfold across the mobile app user journey, from discovery to permission decision, and identify recurring archetypal pathways that shape permission-granting decisions. Our findings highlight why privacy must be understood as a sequential, process-driven experience rather than a single moment of choice.
[Read here]

2024 ACNS

Usable Authentication in Virtual Reality: Exploring the Usability of PINs and Gestures
Glimpse: Gesture-based authentication showed higher usability and faster authentication times, especially for users with less VR experience. Findings suggest that developers should favour native interaction methods for VR rather than porting conventional systems like PIN entry.
[Read here]

2017 IHSI

Identify Subconscious Visual Response from Brain Signals
Glimpse: Humans can subconsciously recognize objects within approximately 13 ms during rapid serial visual presentation (RSVP). EEG analysis reveals distinct neural signal bands that correlate with subconscious visual responses, particularly in the occipital lobe. The study indicates that subconscious visual responses occur at a high frame rate, highlighting rapid brain processing of familiar visual information. [Read here]

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