The use of ubiquitous devices is increasing worldwide due to signs of progress in
sophisticated hardware technology with cutting-edge features. These features offer most …

Smartphones contain access to user-sensitive information such as contacts, e-mails, e-
payments among others. Therefore, it is imperative that proper smartphone authentication …

Iterative design, implementation, and evaluation of prototype systems is a common
approach in Human-Computer Interaction (HCI) and Usable Privacy and Security (USEC); …

Touch screens have become ubiquitous in the past few years, like for instance in
smartphones and tablets. These devices are often the entry door to numerous information …

Nowadays, most users need more passwords than they can handle. Consequently, users
have developed a multitude of strategies to cope with this situation. Some of these coping …

The penetration of ICT in our everyday lives has introduced numerous automations, and the
continuous need for communication has made mobile devices indispensable. As a result …

In this paper we produce a transparent continuous facial authentication scheme that is
aware of the current activity and illumination context. It has recently been shown that …

Humans interact more and more with systems containing AI components. In this work, we
focus on hand gestures such as handwriting and sketches serving as inputs to such …

The spread of biometric applications in mobile devices handled by untrained users opened
the door to sources of noise in mobile iris recognition such as larger extent of rotation in the …

Frequent repetition of vocabulary is essential for effective language learning. To increase
exposure to learning content, this work explores the integration of vocabulary tasks into the …