Feature selection for semi-fragile signature-based authentication systems

In a semifragile signature-based authentication system, the feature selected to form the corresponding content-based signature plays an important role in system design. An inappropriate feature will affect not only system robustness but also system security. We mainly discuss the relationship between the content-based feature and the system security. We start from analyzing several feature representations, which are usually used for semifragile authentication systems, we then draw a generic framework for the purpose of feature evaluation.