Anonymous identification with cancelable biometrics

Cancelable biometrics were introduced by Ratha et al. in 2001 to obtain templates which are renewable and do not let come back to the original biometric trait. We extend this technique to achieve the property of untraceability among different identifications across time. To this end, we need time-dependent templates. We here describe a system relying on time-dependent cancelable biometrics and analyse its security.