Collins Munyendo

Publications

2025

Digital Security Perceptions and Practices Around the World: A WEIRD versus Non-WEIRD Comparison
F. Herbert*, C.W. Munyendo*, J. Hielscher, S. Becker, and Y. Zou
USENIX Security 2025 [PDF] * co-first authors

"You Have to Ignore the Dangers": User Perceptions of the Security and Privacy Benefits of WhatsApp Mods
C.W. Munyendo*, K. Owens*, F. Strong, S. Wang, A.J. Aviv, T. Kohno, and F. Roesner
IEEE S&P 2025 [URL] [PDF] * co-first authors

Reimagining Wearable-Based Digital Contact Tracing: Insights from Kenya and Côte d’Ivoire
K.S. Niksirat, C.W. Munyendo, O.B.L. Neto, M. Katya, C. Kouassi, K. Ochieng, A. Georgina, B. Olayo, J. Barras, C. Cattuto, A.J. Aviv, and C. Troncoso
CHI 2025 (To Appear) [PDF]

2024

"I'm going to try her birthday": Investigating How Friends Guess Each Other's Smartphone Unlock PINs in the Lab
E. Korkes, C.W. Munyendo, A. Isaac, V. Hennemann, and A.J. Aviv
EuroUSEC 2024 [URL] [PDF]

Security, Privacy, and Data-sharing Trade-offs When Moving to the United States: Insights from a Qualitative Study
M. Tran*, C.W. Munyendo*, H.S. Ramulu*, R.G. Rodriguez, L.B. Schnell, C. Sula, L. Simko, and Y. Acar
IEEE S&P 2024 [URL] [PDF] [Video] * co-first authors

It’s Trying Too Hard To Look Real: Deepfake Moderation Mistakes and Identity-Based Bias
J. Mink, M. Wei, C.W. Munyendo, K. Hugenberg, T. Kohno, E.M. Redmiles, and G. Wang
CHI 2024 [URL] [PDF] [Video]

An Analysis of Password Managers' Password Checkup Tools
A. Hutchinson, C.W. Munyendo, P. Mayer, and A.J. Aviv
CHI EA 2024 [URL] [PDF] [Video]

2023

"I just stopped using one and started using the other": Motivations, Techniques, and Challenges When Switching Password Managers
C.W. Munyendo, P. Mayer, and A.J. Aviv
CCS 2023 [URL] [PDF]

"Someone Definitely Used 0000": Strategies, Performance, and User Perception of Novice Smartphone-Unlock PIN-Guessers
D.V. Bailey, C.W. Munyendo, H.A. Dyer, M. Grant, P. Markert, and A.J. Aviv
EuroUSEC 2023 [URL] [PDF]

"In Eighty Percent of the Cases, I Select the Password for Them": Security and Privacy Challenges, Advice, and Opportunities at Cybercafes in Kenya
C.W. Munyendo, Y. Acar, and A.J. Aviv
IEEE S&P 2023 [URL] [PDF] [Video]
Distinguished Paper Award

2022

User Perceptions of Five-Word Passwords
X. Wu, C.W. Munyendo, E. Cosic, G.A. Flynn, O. Legault, and A.J. Aviv
ACSAC 2022 [URL] [PDF] [Slides]

"The Same PIN, Just Longer": On the (In)Security of Upgrading PINs from 4 to 6 digits
C.W. Munyendo, P. Markert, A. Nisenoff, M. Grant, E. Korkes, B. Ur, and A.J. Aviv
USENIX Security 2022 [URL] [PDF] [Video] [Slides]

Why Users (Don’t) Use Password Managers at a Large Educational Institution
P. Mayer, C.W. Munyendo, M.L. Mazurek, and A.J. Aviv
USENIX Security 2022 [URL] [PDF] [Video] [Slides]

"Desperate Times Call for Desperate Measures": User Concerns with Mobile Loan Apps in Kenya
C.W. Munyendo, Y. Acar, and A.J. Aviv
IEEE S&P 2022 [URL] [PDF] [Video]

2021

Strategies and Perceived Risks of Sending Sensitive Documents
N. Warford, C.W. Munyendo, A. Mediratta, A.J. Aviv, and M.L. Mazurek
USENIX Security 2021 [URL] [PDF] [Video] [Slides]

Using a Blocklist to Improve the Security of User Selection of Android Patterns
C.W. Munyendo, M. Grant, P. Markert, T.J. Forman, and A.J. Aviv
SOUPS 2021 [URL] [PDF] [Video] [Slides]