Your Culture Is In Your Password: An Analysis Of A Demographically-Diverse Password Dataset

A large number of studies on passwords make use of passwords leaked by attackers who compromised online services. Frequently, these leaks contain only the passwords themselves, or basic information such as usemames or email addresses. While metadata-rich leaks exist, they are often limited in the variety of demographics they cover.In this work, we analyze a meta-data rich data leak from a Middle Eastern bank,with a demographically-diverse user base. We provide an analysis of passwords created by groups of people of different cultural backgrounds, some of which are under-represented in existing data leaks, e.g., Arab, Filipino, Indian, and Pakistani.The contributions provided by this work are many-fold. First, our results contribute to the existing body of knowledge regarding how users include personal information in their passwords. Second, we illustrate the differences that exist in how users from different cultural/linguistic backgrounds create passwords. Finally, we study the (empirical and theoretical) guessability of the dataset based on two attacker models, and show that a state of the art password strength estimator inflates the strength of passwords created by users from nonEnglish speaking backgrounds. We improve its estimations by training it with contextually relevant information. (C) 2018 Elsevier Ltd. All rights reserved.