On the Effect of Time Efficiency in DSV under Stress

One of the most promising biometric modalities suggested to secure mobile devices is dynamic signature verification. It is widely accepted by users as to sign is considered a usual action. At the time to sign documents, it happens that people tend to feel stress or discomfort, but does it influence negatively to the signature recognition? In this work several users participated in a usability evaluation signing in a common smartphone with a stylus under stress conditions. This is targeting the potential use of this kind of biometric systems in scenarios where the user may suffer a certain level of stress, such as in courts, banks or even shopping. We have focused in one of the main usability factors: the efficiency in terms of the time on tasks. Our findings suggest that longer signatures are more negatively influenced in performance by stress situations than shorter signatures, but this performance decrease is still acceptable for recognition.