Natural Revocability in Handwritten Signatures to Enhance Biometric Security

In the field of cancellable (revocable) biometrics much attention has been paid to physiological biometrics(e.g. fingerprint, iris) when compromised. However, the potential for natural revocability in behavioural biometrics(e.g. handwritten signature) is often overlooked, and the lack of databases to support this type of investigation imposes limitations. This paper presents a preliminary study of natural revocability, revealing relationships among established and new signature forms in relation to achievable stability. We study also the implications at the classification level.