An Analysis on Invertibility of Cancelable Biometrics based on BioHashing

⎯ One of the aims of cancelable biometrics is to protect privacy. In order to protect privacy, cancelable biometrics are preferably to be non-invertible such that no information can be revealed from the cancelable biometrics template, which is stored in databases for personal identification/verification. One way to achieve the non-invertibility is through the use of non-invertible transforms. Recently, some new cancelable biometric approaches are proposed based on BioHashing. Those approaches are utilizing non-invertible transforms to achieve cancelable biometrics and thus non-invertibility is also attained. It is revealed that, however, if cancelable biometric templates are compromised and information about the transformation is uncovered, the process is “invertible” to the extent that the matcher may be fooled.