Bodies of evidence [Communications Biometrics]

Our biometrics - from brain physiognomies down to the characteristics of locomotion or gait - can in theory differentiate one individual from another, and the study of how best to sort between them has resulted in the technological enclave of biometric authentication. Typically, authentication can be classified in three different forms: a user can create an unusual password or personal identification number, use a security token or smart card, or use their own physical or behavioural biometric traits.