Collins Munyendo

Publications

2025

Digital Security Perceptions and Practices Around the World: A WEIRD versus Non-WEIRD Comparison
Franziska Herbert*, Collins W. Munyendo*, Jonas Hielscher, Steffen Becker, and Yixin 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
Collins W. Munyendo*, Kentrell Owens*, Faith Strong, Shaoqi Wang, Adam J. Aviv, Tadayoshi Kohno, and Franziska Roesner
IEEE S&P 2025 [URL] [PDF] * co-first authors

Reimagining Wearable-Based Digital Contact Tracing: Insights from Kenya and Côte d’Ivoire
Kavous Salehzadeh Niksirat, Collins W. Munyendo, Onicio Batista Leal Neto, Muswagha Katya, Cyrille Kouassi, Kevin Ochieng, Angoa Georgina, Bernard Olayo, Jean-Philippe Barras, Ciro Cattuto, Adam J. Aviv, and Carmela 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
Elena Korkes, Collins W. Munyendo, Alvin Isaac, Victoria Hennemann, and Adam J. Aviv
EuroUSEC 2024 [URL] [PDF]

Security, Privacy, and Data-sharing Trade-offs When Moving to the United States: Insights from a Qualitative Study
Mindy Tran*, Collins W. Munyendo*, Harshini Sri Ramulu*, Rachel Gonzalez Rodriguez, Luisa Ball Schnell, Cora Sula, Lucy Simko, and Yasemin 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
Jaron Mink, Miranda Wei, Collins W. Munyendo, Kurt Hugenberg, Tadayoshi Kohno, Elissa M. Redmiles, and Gang Wang
CHI 2024 [URL] [PDF] [Video]

An Analysis of Password Managers' Password Checkup Tools
Adryana Hutchinson, Collins W. Munyendo, Peter Mayer, and Adam 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
Collins W. Munyendo, Peter Mayer, and Adam J. Aviv
CCS 2023 [URL] [PDF]

"Someone Definitely Used 0000": Strategies, Performance, and User Perception of Novice Smartphone-Unlock PIN-Guessers
Daniel V. Bailey, Collins W. Munyendo, Hunter A. Dyer, Miles Grant, Philipp Markert, and Adam 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
Collins W. Munyendo, Yasemin Acar, and Adam J. Aviv
IEEE S&P 2023 [URL] [PDF] [Video]
Distinguished Paper Award

2022

User Perceptions of Five-Word Passwords
Xiaoyuan Wu, Collins W. Munyendo, Eddie Cosic, Genevieve A. Flynn, Olivia Legault, and Adam J. Aviv
ACSAC 2022 [URL] [PDF] [Slides]

"The Same PIN, Just Longer": On the (In)Security of Upgrading PINs from 4 to 6 digits
Collins W. Munyendo, Philipp Markert, Alexandra Nisenoff, Miles Grant, Elena Korkes, Blase Ur, and Adam J. Aviv
USENIX Security 2022 [URL] [PDF] [Video] [Slides]

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

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

2021

Strategies and Perceived Risks of Sending Sensitive Documents
Noel Warford, Collins W. Munyendo, Ashna Mediratta, Adam J. Aviv, and Michelle L. Mazurek
USENIX Security 2021 [URL] [PDF] [Video] [Slides]

Using a Blocklist to Improve the Security of User Selection of Android Patterns
Collins W. Munyendo, Miles Grant, Philipp Markert, Timothy J. Forman, and Adam J. Aviv
SOUPS 2021 [URL] [PDF] [Video] [Slides]