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 …

In search of the silver bullet to solve the password problem, the field of knowledge-based
authentication has become bloated with novel proposals aiming to replace textual …

Despite three decades of intensive research efforts, it remains an open question as to what
is the underlying distribution of user-generated passwords. In this paper, we make a …

Pattern lock has been widely used for authentication to protect user privacy on mobile
devices (eg, smartphones and tablets). Several attacks have been constructed to crack the …

Pattern lock-based authentication has been widely adopted in modern smartphones.
However, this scheme relies essentially on passwords, making it vulnerable to various side …

Personal Identification Numbers (PINs) are ubiquitously used in embedded computing
systems where user input interfaces are constrained. Yet, little attention has been paid to this …

Android's graphical authentication mechanism requires users to unlock their devices by"
drawing" a pattern that connects a sequence of contact points arranged in a 3x3 grid. Prior …

Pattern lock has been widely used in smartphones as a simple and effective authentication
mechanism, which however is shown to be vulnerable to various attacks. In this paper, we …

Pattern lock is widely used for identification and authentication on Android devices. This
article presents a novel video-based side channel attack that can reconstruct Android …

User-generated textual passwords suffer from the conflict between security and usability.
System administrators usually adopt password composition policies to help users choose …