Nowadays, mobile devices are often equipped with high-end processing units and large
storage space. Mobile users usually store personal, official, and large amount of multimedia …

The vast majority of existing work on brain biometrics has been conducted on the ongoing
electroencephalogram. Here, we argue that the averaged event-related potential (ERP) may …

A number of recent scams and security attacks (phishing, spyware, fake terminals,...) hinge
on a crook's ability to observe user behavior. In this paper, we describe the design …

We report on a wearable digital diary study of 26 participants that explores people's daily
authentication behavior across a wide range of targets (phones, PCs, websites, doors, cars …

In recent years, behavioral biometrics have become a popular approach to support
continuous authentication systems. Most generally, a continuous authentication system can …

Authentication in public spaces is a risky task. Frauds on cash machines (ATMs) are not
uncommon nowadays. The biggest group of attacks is observation attacks, which focus on …

Multi-factor authentication involves the use of more than one mode in authentication
processes and is typically employed to increase security compared to a fixed password …

Risk-based Authentication (RBA) is an adaptive security measure to strengthen password-
based authentication. RBA monitors additional features during login, and when observed …

We examine three biometric authentication modalities--voice, face and gesture--as well as
password entry, on a mobile device, to explore the relative demands on user time, effort …

Passwords are the almost universal authentication mechanism, even though they are
basically flawed and cause problems for users due to poor memorability. Graphical methods …