When choosing a token for the purposes of enrolling and verifying a biometric credential, behavioral biometrics present a challenge that doesn’t exist for physical biometrics. For physical biometrics such as fingerprint, palm or iris the choice is simply which finger(s), hand or eye to use. However, with behavioral biometrics, such as voice or handwriting, the words that are chosen as the token are as critical to the overall process as the underlying biometric technology.